Our baby is 5 months old and currently has his British passport only.
I was just on the US Embassy website to have a reminder of how to apply for US citizenship for the baby as well as the forms, etc. for getting his US passport.
You don't need to apply for US citizenship for the baby - they are automatically a US citizen at birth because you are a US citizen, regardless of whether you have filed the CRBA.
All you need to do is register the birth with the US embassy and apply for the baby's US passport.
Now here's my problem: we are going on holiday end of June for 17 days to America. I have just read (I know, I feel so stupid but I didn't think there'd be a problem) that by law if a child has claim to US citizenship they HAVE to enter/depart the US on a US passport only!!! I am so confused by this - is this seriously saying I can't travel with him on his British passport? I haven't applied for his CRBA yet and I just assumed (again, I know I'm an a**) that since I have until he's 18 that it's ok.
It is illegal for a US citizen to enter the US on a foreign passport - your child is a US citizen, therefore they must enter and leave the US on a US passport.
I feel sick at the thought of this screwing up our holiday. What would happen if he goes in on his British passport? Does this somehow mean he'll never be able to have US citizenship or something?!
No, your baby is already a US citizen and nothing will change that.
What it means is that if US immigration realise he is a US citizen trying to enter the US on a UK passport, they can refuse to allow him to enter the US and in that case you would likely have to return to the UK with him.
I would suggest getting the CRBA and US passport application appointment done ASAP and hope you have time to get it before your holiday.
However, looking at the US Embassy London website, it looks like the next available appointment for the CRBA and first passport application is on June 22nd and then it's about a 5-week wait for the passport after that.
Alternatively, the Edinburgh consulate has appointments available from June 10th (but you have to mail documents to them 7 days in advance), and the Belfast consulate has a couple of appointments available from the 4th onwards.