Thank you very much, @secret.simon, for your clear answers and suggestions. I will contact UK embassy as you suggested, to see if there's any emergency document they can help with. In fact, the only requirement is to get the newborn to the UK. Anything that legally gets her to the UK once will do ...

Dear all, I and my wife hold British passports by naturalization for the past couple of years, and we both have OCIs. We are now stuck in India due to Covid situation. A child was born to us in India a month ago, and now we are trying to get the newborn to the UK at the earliest. Following are the ...