Welcome to YT! Yes, 7 weeks is WAY too young to place a pup. Placing them before they are 8 weeks old is even illegal in many states, so what does that tell you? Reputable breeders do not place them until they are around 12 weeks old. If the breeder you are talking to is willing to place one that young, then I would seriously question her ethics as a breeder. Credintials don't guarantee that the breeder is doing what's right by the dogs--but they sure do sound nice for marketing purposes.
Your pup is going to bond with you, even if you wait until he's is a bit older to bring him home. With extremely young pups, low blood sugar is always a big risk. Also, during this age, the pup learns crucial social skills from the mom and littermates. Many people that bring them home too young find that they have issues with biting and more difficulty getting them potty trained--among other issues.