<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2016-05-12</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001437578</issuerCik>
        <issuerName>BRIGHT HORIZONS FAMILY SOLUTIONS INC.</issuerName>
        <issuerTradingSymbol>BFAM</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001040508</rptOwnerCik>
            <rptOwnerName>BAIN CAPITAL INVESTORS LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 CLARENDON STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001417662</rptOwnerCik>
            <rptOwnerName>Bain Capital Fund X LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 CLARENDON STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001525871</rptOwnerCik>
            <rptOwnerName>Bain Capital Partners X, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 CLARENDON STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001379475</rptOwnerCik>
            <rptOwnerName>BCIP Associates III, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 CLARENDON STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001379476</rptOwnerCik>
            <rptOwnerName>BCIP Associates III</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 CLARENDON STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001379517</rptOwnerCik>
            <rptOwnerName>BCIP Associates III-B, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 CLARENDON STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001379519</rptOwnerCik>
            <rptOwnerName>BCIP Associates III-B</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 CLARENDON STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001379518</rptOwnerCik>
            <rptOwnerName>BCIP T Associates III, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 CLARENDON STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001379520</rptOwnerCik>
            <rptOwnerName>BCIP Trust Associates III</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 CLARENDON STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001379516</rptOwnerCik>
            <rptOwnerName>BCIP T Associates III-B, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 CLARENDON STREET</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2016-05-12</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>221411</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>16284859</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                    <footnoteId id="F6"/>
                    <footnoteId id="F7"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Bain Capital Investors, LLC (&quot;BCI&quot;) is the sole general partner of Bain Capital Partners X, L.P. (&quot;BCP X&quot;), which is the sole general partner of Bain Capital Fund X, L.P. (&quot;Fund X&quot;).  As a result, BCP X may be deemed to share voting and dispositive power with respect to the shares of Common Stock held by Fund X.  BCP X disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.  On May 12, 2016, Fund X distributed 219,961 shares of Common Stock to one or more members or partners in connection with certain charitable gifts made on May 12, 2016. Following such distribution, Fund X held 16,095,642 shares of Common Stock.</footnote>
        <footnote id="F2">On May 12, 2016, BCIP Associates III, LLC (&quot;BCIP III&quot;), whose manager is BCIP Associates III (&quot;BCIPA III&quot;), whose managing partner is Boylston Coinvestors, LLC (&quot;Boylston&quot;), distributed 1,450 shares of Common Stock to one or more of its members or partners in connection with certain charitable gifts made on May 12, 2016.  Following such distribution, BCIP III held 113,083 shares of Common Stock.  BCIPA III may be deemed to share voting and dispositive power with respect to the shares of Common Stock held by BCIP III.  BCIPA III disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.</footnote>
        <footnote id="F3">As of May 12, 2016, BCIP Associates III-B, LLC (&quot;BCIP III-B&quot;), whose manager is BCIP Associates III-B (&quot;BCIPA III-B&quot;), whose managing partner is Boylston, held 20,793 shares of Common Stock.  BCIPA III-B may be deemed to share voting and dispositive power with respect to the shares of Common Stock held by BCIP III-B.  BCIPA III-B disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.</footnote>
        <footnote id="F4">As of May 12, 2016, BCIP T Associates III, LLC (&quot;BCIPT III&quot;), whose manager is BCIP Trust Associates III (&quot;BCIPTA III&quot;), whose managing partner is Boylston, held 49,732 shares of Common Stock.  BCIPTA III may be deemed to share voting and dispositive power with respect to the shares of Common Stock held by BCIPT III.  BCIPTA III disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.</footnote>
        <footnote id="F5">As of May 12, 2016, BCIP T Associates III-B, LLC (&quot;BCIPT III-B&quot;), whose manager is BCIP Trust Associates III-B (&quot;BCIPTA III-B&quot;), whose managing partner is Boylston, held 3,444 shares of Common Stock.  BCIPTA III-B may be deemed to share voting and dispositive power with respect to the shares of Common Stock held by BCIPT III-B.  BCIPTA III-B disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.</footnote>
        <footnote id="F6">As of May 12, 2016, BCIP Associates-G (&quot;BCIP G&quot; and together with Fund X, BCIP III, BCIP III-B, BCIPT III and BCIPT III-B, the &quot;Bain Capital Entities&quot;), whose managing partner is Boylston, held 2,165 shares of Common Stock.</footnote>
        <footnote id="F7">The governance, investment strategy and decision-making process with respect to the investments held by the Bain Capital Entities is directed by the Global Private Equity Board of BCI. As a result, BCI may be deemed to share voting and dispositive power with respect to all of the shares of Common Stock held by the Bain Capital Entities. BCI disclaims beneficial ownership of such securities except to the extent of its pecuniary interest therein.</footnote>
    </footnotes>

    <remarks>Form 1 of 2</remarks>

    <ownerSignature>
        <signatureName>BAIN CAPITAL FUND X, L.P., BY: Bain Capital Partners X, L.P., its general partner, BY: Bain Capital Investors, LLC, its general partner, By: /s/ David Humphrey, Name: David Humphrey, Title: Managing Director</signatureName>
        <signatureDate>2016-05-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>BAIN CAPITAL PARTNERS X, L.P., BY: Bain Capital Investors, LLC, its general partner, By: /s/ David Humphrey, Name: David Humphrey, Title: Managing Director</signatureName>
        <signatureDate>2016-05-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>BCIP Associates III, LLC, By: BCIP Associates III, its Manager, By: Boylston Coinvestors, LLC, as Managing Partner, By: /s/ David Humphrey, Name: David Humphrey, Title: Authorized Signatory</signatureName>
        <signatureDate>2016-05-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>BCIP Associates III, By: Boylston Coinvestors, LLC, as Managing Partner, By: /s/ David Humphrey, Name: David Humphrey, Title: Authorized Signatory</signatureName>
        <signatureDate>2016-05-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>BCIP Associates III-B, LLC, By: BCIP Associates III-B, its Manager, By: Boylston Coinvestors, LLC, as Managing Partner, By: /s/ David Humphrey, Name: David Humphrey, Title: Authorized Signatory</signatureName>
        <signatureDate>2016-05-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>BCIP Associates III-B, By: Boylston Coinvestors, LLC, as Managing Partner, By: /s/ David Humphrey, Name: David Humphrey, Title: Authorized Signatory</signatureName>
        <signatureDate>2016-05-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>BCIP T Associates III, LLC, By: BCIP Trust Associates III, its Manager, By: Boylston Coinvestors, LLC, as Managing Partner, By: /s/ David Humphrey, Name: David Humphrey, Title: Authorized Signatory</signatureName>
        <signatureDate>2016-05-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>Bain Capital Investors, LLC, By: /s/ David Humphrey, Name: David Humphrey, Title:  Managing Director</signatureName>
        <signatureDate>2016-05-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>BCIP Trust Associates III, By: Boylston Coinvestors, LLC, as Managing Partner, By: /s/ David Humphrey, Name: David Humphrey, Title: Authorized Signatory</signatureName>
        <signatureDate>2016-05-16</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>BCIP T Associates III-B, LLC, By: BCIP Trust Associates III-B, its Manager, By: Boylston Coinvestors, LLC, as Managing Partner, By: /s/ David Humphrey, Name: David Humphrey, Title: Authorized Signatory</signatureName>
        <signatureDate>2016-05-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
