My son fell out of his crib and hit head first on floor he seems fine but he keeps swallowing a lot what should I do he is playing but also looks a little white in face

MD exam now. He needs to be examined asap. These injuries can seem benign at first and become serious later. Take him in for an exam.
Watch for 8 hrs. It would be extremely unlikely to have significant bleeding, but watch for unusual sleepiness, difference in pupil size, nausea/vomitting. Concussions have variable presentation and symptoms can show up even after 12 hours. You know your child best, and can tell if there is anything worrisome going on.