well regardless your baby is adorable and i am also a believer that a chubby puppy is good
they run around so much they need their energy...my bentley was such a chub (and he is considered cobby and he had thick, gorgeous puppy hair) and he looked ginormous
i think at 3 or 4 weeks he was over 1.5 lbs ... he actually had ROLLS on his arms and legs and a double chin ... he grew out of it though and stands now (over a year old) at a shade over 3 lbs
i think your puppy looks healthy and beautiful!