Hi, 4 weeks is really young. Are you bottle feeding the pup with formula? I have 6 "Blue" Pitbull puppies, that are 5 weeks today. I have a Rednose pit named, Cassie. She is 3 years old. My daughter has a female & male blue pit, she lives with us. Honey, the blue female is the one who had the litter. The dad, his name is Blue, is Razor Edge and is very thick, big head. He scares people that don't know him. He is such a cuddly baby. He thinks he is a little lap dog, and tries to sit on our lap. Do you know of any webs or on this one, where to post free ads for the sale of the puppies. Can I put something on here? Good luck with your little puppy. Talk to you soon.