You should register the birth of your baby at the local register office (https://www.gov.uk/register-offices) For the area where the baby was born.
If you can’t register the birth in the area where the baby was born, you can go to another register office to make a birth declaration and they will send your details to the correct office where the registration will then be recorded in the correct register.
A birth registration can only be carried out by a qualified informant:
Information for registration is required to be given, in person, within 42 days of the birth and certain people have a legal responsibility to do this.
In order of preference they are as follows:
partnership with the child’s mother
Where the father is not married to the child’s mother at birth or conception his name and other particulars cannot be recorded in the register unless he attends with the mother to register (although he has no legal duty to do so).
There are certain circumstances where registrations can be carried to include the fathers’ details e.g. by producing a court order; however this will need to be discussed with the registrar at time of making the appointment to register the birth.
You can book directly with your local registrant by contacting:
Bridgend: https://www.bridgend.gov.uk/residents/births-deaths-and-marriages/register-a-birth/
Rhondda Cynon Taf: https://www.rctcbc.gov.uk/EN/Resident/BirthsMarriagesandDeaths/Births/Registeringabirth.aspx
Merthyr Tydfil: https://www.merthyr.gov.uk/resident/births-deaths-marriages/registering-a-birth/