I went to the embassy today and registered Philips birth, got his social security number applied for, and also applied for his US passport (everyone there confirmed that it's technically illegal for him to fly to the US using anything but his US passport, since he's eligible for one).
THe forms are all on the embassy's website, and easy to find. Here's waht we did:
Got Philip's passport photos taken (www.passportphotos.co.uk
Went to the embassy at 2:00 (our appointment was for 2:30) and stood in the (short) line.
Went through security twice. Once outside, once inside.
Handed the lady at the reception desk all of the following:
1. Form DS-11 (The app for a US passport. Pages 1 & 2 get ignored since they are appropriate only for those filing from the US). The embassy's website has instructions on how to file it from the UK.
2. Form DS-2029 (The app to register his birth. Page 2 is his app for a social security number).
3. Needed documentation: Philips LONG birth certificate (they won't accept the short ones), our passports, our marriage certificate, our appointment confirmation heet, David's divorce papers)
We had a lot of questions aboout filling out the forms before we got there, but you can NOT get anyone to answer questions at the embassy about this process. They say "write to us". Even last night when I called, they said "write to us" I said, "my appointment is tomorrow", she said" Then leave the questions blank and we'll help you when you get here". Sigh. Fine.
So when we got to the reception desk we handed her all of our documents, with the forms only 2/3 filled. She helped us answer all the blanks though - obviously she's used to getting incomplete forms! Then it was just a matter of waiting, being called up to the desk, waiting... all told we were there for 2.5 hours. Wasn't too bad at all, they were nice and helpful.
You can only register your children if they are under 16 or under 18, I'm not sure which, and the procedure (I believe) is slightly different for older children, though there were some 5-6 year olds there getting their passports as well.