take it to the vet..it may have brain damage

don't worry too much, but if possible take it to the vet just in-case.. and in future make sure that the puppies are not on a ledge, or sofa of some sort, try to keep them at ground level!
congrats on the puppies,

i know they are only just born and their eyes are probably not open but if they were look for a glazed over look a problem in walking straight i know newborns but compared to the others is there a significant difference in his gate. throwing up alot is also a sign of trauma.and a fever just keep a good watch over it and compare its behavior to the others and take to vet right away if you see a difference. good luck and congrats.

sorry wasent paying attention to the date lol. disregard but use for future use haha.