Hi.
Pepper goes through this every now and then...the first few times scared me half to death. All I can tell you is let nature take its course and things will go back to normal! Otherwise...here is what a vet said once (I swear!)
He said put a bit of regular sugar on "it" and it will go down and back in. Now I've never done that but with my other yorkie I DID put him in the sink and put warm water on it. With Pepper I just leave him alone, telling him he is on his own with this particular problem. Tho the truth is he looks so confused that I have a hard time not laughing! Hope your baby is feeling better by now!