Hello, my name is***** and I have over 20 years of experience as a veterinarian. I understand that you are concerned about your new puppy's physique because she appears to have a bloated abdomen.
Most puppies have poor/weaker abdominal muscle strength compared to an adult's abdominal musculature, so their abdomens often look rounder than an adult dog's would.
Most puppies also have gastrointestinal parasites and those too can create a bloated looking abdomen. Has this little one been wormed? Puppies should be on a worming program. I generally recommend a broad spectrum wormer like pyrantel, which is very gentle and safe yet kills roundworms and hookworms, be given every 2 weeks until roughly 12-16 weeks of age and then the pup should be wormed monthly. That can be accomplished by giving a heartworm prevention that has a gastrointestinal wormer too. Examples include Heartgard Plus, Sentinel or Iverhart Max. It is still important to check several stool samples to make sure she doesn't have an unusual parasite that the usual wormers don't cover. And it is well worth checking at least a couple fresh stool samples as parasite eggs/cysts are shed intermittently which means they aren't shed in every stool. They may be picked up on the second sample or third test if the first is negative.
If the puppy is eating a diet that is high in fiber or not of the highest quality then she may need to eat more food to grow properly, thus she may look bloated.
It will be important compare this puppy to her littermates. If she is growing as well as they are, and is playful, active and alert then she is probably fine. But I do recommend making sure she is being fed a high quality food, and that she be on a good broad spectrum wormer.
Please let me know if you have any further questions.