British citizenship for my daughter

Hello
Hope you are doing well. I need your help please.

I was naturalised British citizen in 2023, I work and live in the UK. However my girlfriend lives in South Africa (she works and lives there and not planing to relocate in the UK).

My gf is pregnant and will give birth soon. And I have few questions:
- will my daughter be British citizen straight after birth?
- what documents I need to submit and where For the first passport? Please note that they live in South Africa.
Basically I just need guidances to apply for her first passport after birth and guidance on what to do.
Thank you.

Daughter will be British by descent. You can apply for her first passport by answering the questions in this form - input details based on your circumstances and you will receive the right instructions. https://www.gov.uk/apply-renew-passport

Note that passports from abroad take notoriously longer to be processed.

Thank you for your support. I went through the link and had a simulation and provided the data.

At the end they requested some documents that make sense and some don’t make sense like:
- grandparents birth/ adoption certificates?
- my girlfriend grandparents marriage certificate????

I’m confused what’s the above documents have to do with my child? Plus I don’t have them and can’t provide as they passed away ages ago.

The other documents required like: birth certificate/ my naturalisation certificate/ hospital records make sense. But documents about grandparents do not make sense in my case. Any advices please??? Thanks

The form caters for all scenarios of British citizenship.
Your child's claim to citizenship is through you as British father.
Grandparents are not relevant in this case and you only provide documents relating to your circumstances.