Diarrhea in young puppies can have many causes. It sounds like your puppies are around 12 weeks old. If they are eating and drinking normally and their attitude is good you can give protectants such as pepto bismol or kao pectate at 0.5cc per pound body weight by mouth 2-3 times a day. Feeding bland easily digested foods such as yogurt, baby food or scrambled egg can give the intestine a rest. If your puppies are not eating well, if their attitude is not normal, or if the diarrhea has been present more than 2 days you should have them examined. See the gastrointestinal section of common conditions in the Doctorpup website for a discussion of some of the causes of diarrhea.