I've seen several puppies that are that weight for their age. Mine was born weighing 3.7 oz and he's 16 days old and weighs exactly 16 oz! After the 3rd day he begain gaining about 1 oz per day. Ive read by several posts that after he is weaned and starting to eat puppy food ,he will slim down within a week so dont worry
Genie,Cookie,Lola ,Angel & Lucky