While healthy but smaller than average puppies sometimes appear in normal litters, unscrupulous breeders may sell runts, premature puppies or malnourished puppies as teacups. (reference.com)
A typical biting puppy is on average a puppy between the age of 8 weeks and 7 - 8 months old. (puppy-training-solutions.com)
The average puppy is recommended to receive: three distemper / parvo combos, two bordetellas, and one rabies vaccine. (allaboutpetsprovo.com)