Form

How to apply for a child’s birth re-registration following the mother and father’s marriage or civil partnership (English and Welsh - accessible)

Updated 13 July 2026

1. General Information / Gwybodaeth Gyffredinol

Section 14 of the Births and Deaths Registration Act 1953 allows the re-registration of a child’s birth in England and Wales following the parents’ marriage or civil partnership.

Mae Adran 14 Deddf Cofrestru Genedigaethau a Marwolaethau 1953 yn caniatáu ailgofrestru genedigaeth plentyn yng Nghymru a Lloegr yn dilyn priodas neu bartneriaeth sifil y rhieni.

One parent is required to attend a register office in England or Wales to make the re-registration. Mae’n ofynnol i un rhiant fynd i swyddfa gofrestru yng Nghymru neu Loegr i ailgofrestru.

If both parents live outside of England and Wales and cannot attend a register office, the application must be sent to the General Register Office (GRO).

Os yw’r ddau riant yn byw y tu allan i Gymru a Lloegr, ac na allant fynd i swyddfa gofrestru, rhaid anfon y cais i’r Swyddfa Gofrestru Gyffredinol (GRO).

2. How do I apply for a re-registration? / Sut ydw i’n gwneud cais am ailgofrestru?

If you are the child’s parents and are now husband and wife, or civil partners, you must complete the LA1 form ‘Application for the re-registration of a child’s birth following the marriage / civil partnership of the mother and father’.

Os mai chi yw rhieni’r plentyn, ac yn awr yn ŵr a gwraig, neu’n bartneriaid sifil, rhaid i chi lenwi’r ffurflen LA1 ‘Cais am ailgofrestru genedigaeth plentyn yn dilyn priodas / partneriaeth sifil y fam a’r tad’.

3. Where can I get an application form? / Ble gallaf gael ffurflen gais?

• By downloading it from / Drwy ei lawrlwytho o

https://www.gov.uk/government/publications/application-to-re-register-a-childs-birth-following-marriage-of-natural-parents

• Your local register office may be able to supply you with one / Efallai y bydd eich swyddfa gofrestru leol yn gallu rhoi un i chi

• You can request an application form to be posted to you by calling / Gallwch ofyn am ffurflen gais i’w phostio atoch drwy ffonio 0300 123 1837

4. Is there a fee? / A oes ffi?

There is no charge for the re-registration of the birth, but you will have to pay for any new certificates following the re-registration.

Nid oes tâl am ailgofrestru’r enedigaeth, ond bydd rhaid i chi dalu am unrhyw dystysgrifau newydd yn dilyn yr ailgofrestru.

5. What documents should I include with my application? / Pa ddogfennau ddylwn eu cynnwys gyda fy nghais?

The following documents should be included with your application form: Dylid cynnwys y dogfennau canlynol gyda’ch ffurflen gais:

• your child’s birth certificate / tystysgrif geni eich plentyn

• your marriage / civil partnership certificate / eich tystysgrif priodas / partneriaeth sifil

• any document asked for in section 5 of the application form, and / unrhyw ddogfen y gofynnir amdani yn adran 5 y ffurflen gais, ac

• if the child or a parent is not living, the death certificate(s) if applicable. / os nad yw’r plentyn neu riant yn fyw, y dystysgrif/tystysgrifau marwolaeth, os yn berthnasol.

6. Where do I send my application and documents to? / I ble ydw i’n anfon fy nghais a’m dogfennau?

The following options provide advice about where to send your application. Please note, your application will be delayed if you do not send your documents to the correct office.

Mae’r opsiynau canlynol yn rhoi cyngor ynghylch ble i anfon eich cais. Sylwer, bydd eich cais yn cael ei ohirio os na fyddwch yn anfon eich dogfennau i’r swyddfa gywir.

Option 1 / Opsiwn 1

The following criteria must be met: Rhaid bodloni’r meini prawf canlynol: -The child is living. Mae’r plentyn yn fyw. -You married or formed a civil partnership after the child’s birth. Gwnaethoch briodi neu ffurfio’ch partneriaeth sifil ar ôl genedigaeth y plentyn. -You married or formed a civil partnership in the United Kingdom. Gwnaethoch briodi neu ffurfio’ch partneriaeth sifil yn y Deyrnas Unedig. -The father was domiciled in the United Kingdom at the time of the marriage or civil partnership. Roedd y tad yn byw yn y Deyrnas Unedig ar adeg y briodas neu’r bartneriaeth sifil. -You have answered NO to ALL of the questions in section 5 of the application form. Rydych wedi ateb NA i BOB cwestiwn yn adran 5 y ffurflen gais. -Either parent can attend a register office in England or Wales. Gall y naill riant neu’r llall fynd i swyddfa gofrestru yng Nghymru neu Loegr. - No correction has been made to your child’s birth registration to remove the father’s details. Ni wnaed unrhyw gywiriad i gofrestriad geni eich plentyn i ddileu manylion y tad.

1) Contact the register office you both wish to go to. Cysylltwch â’r swyddfa gofrestru yr hoffech i’r ddau fynd iddi 2) Advise them you have completed the application form for the re-registration. Rhowch wybod iddynt eich bod wedi cwblhau’r ffurflen gais ar gyfer yr ailgofrestru 3) Follow any instructions provided by the local register office. Dilynwch unrhyw gyfarwyddiadau a ddarperir gan y swyddfa gofrestru leol If all of Option 1 criteria apply, contact a register office. If not, send the application to GRO. Os yw pob un o’r meini prawf Opsiwn 1 yn berthnasol, cysylltwch â swyddfa gofrestru. Os na, anfonwch y cais at GRO.

Option 2 / Opsiwn 2

Any other individual circumstances not covered by the Option 1 criteria. Unrhyw amgylchiadau unigol eraill nad ydynt wedi’u cwmpasu gan feini prawf Opsiwn 1.

1) Your completed application form can either be sent by post to GRO or submitted to your local register office to be forwarded to GRO Gellir anfon eich ffurflen gais wedi’i chwblhau drwy’r post at y GRO, neu ei chyflwyno i’ch swyddfa gofrestru leol i’w hanfon ymlaen at y GRO 2) Send certified photocopies of original documents as stated at section 5 of this guidance document Anfonwch lungopïau ardystiedig o ddogfennau gwreiddiol fel y nodir yn adran 5 y ddogfen ganllaw hon

7. What does a re-registration look like? / Sut olwg sydd ar ailgofrestru?

A new birth registration will be created to show the child’s birth registration as that of their parent’s marriage or civil partnership.

Bydd cofrestriad geni newydd yn cael ei greu i ddangos cofrestriad genedigaeth y plentyn fel cofrestriad priodas neu bartneriaeth sifil eu rhiant.

8. Do I need to send in original documents? / Oes angen i mi anfon dogfennau gwreiddiol?

When sending the application to your local register office or by post to GRO, the application form must be an original document. The other documents required with your application should be certified as true copies of original documents. A list giving examples of suitable persons can be found at:

Wrth anfon y cais i’ch swyddfa gofrestru leol neu drwy’r post i’r GRO, rhaid i’r ffurflen gais fod yn ddogfen wreiddiol. Dylai’r dogfennau eraill sy’n ofynnol gyda’ch cais gael eu hardystio fel copïau gwir o ddogfennau gwreiddiol. Mae rhestr sy’n rhoi enghreifftiau o bobl addas yn:

https://www.gov.uk/certifying-a-document

The person certifying the photocopies must not be related by birth or marriage/civil partnership to the applicant(s), be in a personal relationship with them or live at the same address. The certifier should:

Ni ddylai’r person sy’n ardystio’r llungopïau fod yn perthyn drwy enedigaeth neu

briodas/partneriaeth sifil i’r ymgeisydd/ymgeiswyr, bod mewn perthynas bersonol â nhw, na byw yn yr un cyfeiriad. Dylai’r ardystiwr:

a. include the words - “Certified to be a true copy of the original seen by me” / cynnwys y geiriau - “Wedi’i ardystio yn gopi gwir o’r gwreiddiol a welwyd gennyf i”

b. sign and date the photocopy / llofnodi a dyddio’r llungopi

c. print their name under the signature / ysgrifennu eu henw o dan y llofnod

d. confirm their occupation / cadarnhau eu galwedigaeth

e. add their address and telephone number / ychwaneg eu cyfeiriad a’u rhif ffôn

If you are taking the application to a register office, then they should be able to certify your documents as a true copy of the original which means you can retain your original documentation.

Os ydych yn mynd â’r cais i swyddfa gofrestru, yna dylent allu ardystio eich dogfennau fel copi gwir o’r gwreiddiol, sy’n golygu y gallwch gadw eich dogfennaeth wreiddiol.

GRO or the Local Registration Service reserves the right to ask you to submit the original document if needed.

Mae gan y GRO neu’r Gwasanaeth Cofrestru Lleol yr hawl i ofyn i chi gyflwyno’r ddogfen wreiddiol os oes angen.

GRO will confidentially destroy all certified copies submitted with the application unless specifically asked to return them.

Bydd y GRO yn dinistrio’n gyfrinachol yr holl gopïau ardystiedig a gyflwynir gyda’r cais, oni bai y gofynnir yn benodol iddynt eu dychwelyd.

9. What details should be recorded for the father? / Pa fanylion y dylid eu cofnodi ar gyfer y tad?

The following guidance explains how the father’s details should be recorded on the application form:

Mae’r canllawiau canlynol yn esbonio sut y dylid cofnodi manylion y tad ar y ffurflen gais:

• Surname – Record the father’s surname as shown in the child’s birth registration. Where the father was not recorded at registration, enter the surname he was using at the time of the child’s birth.

Cyfenw - Cofnodwch gyfenw y tad fel y dangosir yng nghofrestr geni’r y plentyn. Os nad oedd y tad wedi’i gofnodi wrth gofrestru, nodwch y cyfenw yr oedd yn ei ddefnyddio ar adeg geni’r plentyn.

• Forename(s) – Record the father’s forename(s) as shown in the child’s birth registration. Where the father was not recorded at registration, enter the forename(s) he was using at the time of the child’s birth.

Enw(au) – Cofnodwch enw (au) y tad fel y dangosir yng nghofrestriad geni’r y plentyn. Os nad oedd y tad wedi’i gofnodi wrth gofrestru, nodwch y prif enw(au) yr oedd yn ei ddefnyddio ar adeg geni’r plentyn.

• Place of birth (Town and County) – Record the town and county in which the father was born.

Man geni (Tref a Sir) – Cofnodwch y dref a’r sir lle ganwyd y tad.

• Occupation (if unemployed or retired give last job) – Record the father’s occupation either at the time of the child’s birth or at the time of the re-registration. If the father was unemployed or retired, record his last occupation.

Galwedigaeth (os yw’n ddi-waith neu’n ymddeol, rhowch y swydd olaf) – Cofnodwch alwedigaeth y tad naill ai ar adeg geni’r plentyn neu ar adeg yr ailgofrestru. Os oedd y tad yn ddi-waith neu’n ymddeol, cofnodwch ei alwedigaeth olaf.

10. What details should be recorded for the mother? / Pa fanylion y dylid eu cofnodi ar gyfer y fam?

The following guidance explains how the mother’s details should be recorded on the application form:

Mae’r canllawiau canlynol yn esbonio sut y dylid cofnodi manylion y fam ar y ffurflen gais:

• Surname now – Record the surname by which the mother is immediately known by following her marriage or civil partnership to the father.

Cyfenw nawr - Cofnodwch y cyfenw y mae’r fam yn cael ei hadnabod ar unwaith trwy ddilyn ei phriodas neu bartneriaeth sifil â’r tad.

• Forename(s) – Record the mother’s forename(s) as shown in the child’s birth registration.

Enw(au) – Cofnodwch enw (au) y fam fel y dangosir yng nghofrestiad geni’r y plentyn.

• Maiden surname – Record the surname the mother was known by when she contracted her first marriage or civil partnership.

Cyfenw morwynol – Cofnodwch y cyfenw yr oedd y fam yn ei hadnabod pan gontractiodd ei phriodas gyntaf neu bartneriaeth sifil.

• Occupation (if unemployed or retired give last job) – Record the mother’s occupation either at the time of the child’s birth or at the time of the re-registration. If the mother was unemployed or retired, record her last occupation.

Galwedigaeth (os yw’n ddi-waith neu’n ymddeol, rhowch y swydd olaf) – Cofnodwch alwedigaeth y fam naill ai ar adeg geni’r plentyn neu ar adeg yr ailgofrestru. Os oedd y fam yn ddi-waith neu’n ymddeol, cofnodwch ei galwedigaeth olaf.

• Mother’s marital / civil partnership status – Tick the box that reflects the mother’s marital / civil partnership status at the time of the child’s birth. If the mother has previously been married or in a civil partnership, provide the relevant details.

Statws priodasol / partneriaeth sifil y fam – Ticiwch y blwch sy’n adlewyrchu statws priodasol / partneriaeth sifil y fam ar adeg geni’r plentyn. Os yw’r fam wedi bod yn briod neu’n bartneriaeth sifil o’r blaen, rhowch y manylion perthnasol.

11. If one of the parents has died, can the birth be re-registered? / Os yw un o’r rhieni wedi marw, a ellir ailgofrestru’r enedigaeth?

Yes, if the father’s name was entered on the original birth registration of the child, or there has been a legal ruling (court order) establishing the father’s details.

Oes, os cofnodwyd enw’r tad ar gofrestriad geni gwreiddiol y plentyn, neu os bu dyfarniad cyfreithiol (gorchymyn llys) sy’n sefydlu manylion y tad.

12. If the child has died, is it possible to re-register the child’s birth? / Os yw’r plentyn wedi marw, a yw’n bosib ailgofrestru genedigaeth y plentyn?

Yes, if the child was living at the time of the parents’ marriage or civil partnership. Ydy, os oedd y plentyn yn fyw ar adeg priodas neu bartneriaeth sifil y rhieni.

13. Where can I find out more? / Ble gallaf gael rhagor o wybodaeth?

For further information please contact your local register office or contact the General Register Office on 0300 123 1837 (Mon – Fri: 9am – 5pm), email GROCasework@gro.gov.uk or visit the following link:

Am ragor o wybodaeth, cysylltwch â’ch swyddfa gofrestru leol neu cysylltwch â’r Swyddfa Gofrestru Gyffredinol ar 0300 123 1837 (Llun – Gwener: 9am – 5pm), e-bostiwch GROCasework@gro.gov.uk, neu ewch i’r ddolen ganlynol:

https://www.gov.uk/general-register-office

The information contained in this leaflet is based on the Births and Deaths Registration Act 1953 and Legitimacy Act 1976 but is not a full statement of the law.

Mae’r wybodaeth yn y daflen hon yn seiliedig ar Ddeddf Cofrestru Genedigaethau a Marwolaethau 1953 a Deddf Cyfreithlondeb 1976, ond nid yw’n ddatganiad llawn o’r gyfraith.

For the purpose of detecting and preventing crime, information relating to an application may be passed to and verified with other government departments or law enforcement agencies.

At ddiben canfod ac atal troseddau, gellir trosglwyddo a gwirio gwybodaeth sy’n ymwneud â chais ag adrannau eraill y llywodraeth neu asiantaethau gorfodi’r gyfraith.

The General Register Office is part of His Majesty’s Passport Office.

Mae’r Swyddfa Gofrestru Gyffredinol yn rhan o Swyddfa Basbort Ei Fawrhydi.