You'll need to register your baby before you can get a birth certificate.
Read the GOV.UK complete guide to registering a birth to find out:
It is best to register the birth at the register office in the district where the baby was born.
If your baby was born in Westminster you can register the birth at the Westminster Registration Office, 317 Harrow Road, London W9 3RJ.
Please call 020 7641 7500 to make an appointment.
There is no fee to register a birth and a free short certificate will be issued at the appointment.
There are two types of birth certificate:
A full certificate is required for a passport application.
You can buy copies of birth certificates for births that occurred in Westminster.