Call your breeder and ask them what they are feeding the puppies and go and get a bag. Ask the breeder to recommend an amount.
Yes six weeks is young, but it is old enough to be weaned. Pedigree is not really great food. There are lots of threads on puppy foods, but you should feed whatever your breeder had the puppy on, and then switch her slowly, over the course of several days to whatever you want to feed.
Diarrhea can be very dangerous in young puppies. Have you taken the puppy to the vet yet? Did the breeder give her the first set of shots? Either way, do not take the pup to the pet store. Too dangerous at this point, she can catch anything whether she has had a set of shots or not.
Make sure your pup is not getting dehydrated. Usually when you press the gum and it will push the color from pink to white, but it should recover right away. Do NOT feed the puppy cow's milk it will make things worse not better. What you can do, is boil some chicken and make some brown rice, remove the bones and feed her the chicken and brown rice four times a day in small amounts until he stool improves. Then slowly put her onto whatever type of dog food you want to use.
Welcome to the board.
Jenna, RN CGC & Babs, CD RA CGC HIC
Heidi, RA CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear CGC