You must register your baby before you can get a birth certificate.
It's 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 by making an appointment at Westminster Registration Office, 317 Harrow Road, London W9 3RJ.
There is no fee to register a birth. A free short certificate will be issued at the appointment. Full certificates can be purchased using cash or credit/debit card from the registrar at the end of your 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 registered births that occurred in Westminster.
Read the GOV.UK complete guide to registering a birth to find out: