I am a UK citizen and I live in Colombia. My daughter is due to be born soon. When she is born I will register her birth at the UK Embassy here in Colombia so she will have a UK birth certificate and will be a UK Citizen. Due to time constraints, in the first instance it's easier and quicker for us to get her a Colombian Passport (later we'll get her UK one). Will she need a UK visa to visit the UK if she is travelling on her Colombian passport?
You may need to clarify this with the consulate in Colombia but from what I can see online your daughter will be a Family Visitor traveling as a Colombian citizen, which means that she will need a visa to enter.
So I would suggest that you apply not only for the British Birth certificate but also for a travel document for her to enter the UK as well.