Feed a puppy a stricktly raw diet and ul end up in bother rickets(calcium deficiency) being one of the main and serious problems,feed a good puppy food like pedigree puppy,beta pup or the likes thats not cheap,and then add meat to it so the pups get what they need and that little extra,i generally boil beef or tripe for pups using the juice to soak the dry in,this puts extra weight on the pup and the dry food provides the rest of the vitamins the pup requires!
other than that let the puppy be a puppy traing too early will sometimes bore or dant a pup even make it nervous at 13 weeks and up