It's not clear to me that she *could* have registered the birth with a US Embassy or Consulate, because she was not eligible to pass citizenship to a child born outside the country. So why would the embassy register the birth of a foreign national?
Now I don't know if she would have needed to show a copy of the foreign, that is Kenyan/British, BC to prove that he was indeed her child and not some baby she was smuggling in. This might have been made even more likely by the fact that he was a black baby and she was white. If she did have to show a foregin BC, what the folks at the Port of Entry might have would be a copy of the original Kenyan/British BC? That's way I read the thing about the BC, that it was not a US BC, but rather a Kenyan/British Colonial one. I missed the part about it being at the port of entry. Which could be Seattle after a hop from Kenya to London maybe to Labrador and on to Seattle. (Wouldn't that have been fun with a brand new baby?) Then it would have been on to Hawaii from there. Other POEs are obviously also possible.
We’re thinking on paralellel roads. A young girls with a new baby would not want to travel alone with just the baby and his paper work..
IMO Sr would have travel with her...I think our first port should be the closest one to Harvard where hHE was attending school.
He would have assisted her in getting back into the country with the baby and his paper work. Then she could have continued her trip to friends and family in WA and HI.