Passport to travel to the USA

My husband (expat) and I (Brit) had our first baby in November 2020, and with Covid etc we didn't get round to registering her broth with the Embassy. Well we now want to travel back to see family (in July). We've heard she'll have to travel on a US passport. Which means us registering her birth and applying for a passport as soon as possible, but obviously there are very limited appointments. Would we be able to fly on a UK passport if we've not been able to get an appointment? Any ideas or suggestions?

Your US citizen child has to enter the US on a US passport, which means you need one before you travel.

Have you joined the group on telegram where you get updates about appointments?? I know what you mean though: even with that group it took me four months to get an appointment (part of that was difficulty for my husband getting time off at short notice though).


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When I got my child's passport at the embassy in London, they gave me several very serious lectures about never entering the US on a different passport than the US one.  Not sure why, but they really considered this to be a big deal and I would not plan to do it.