If you wean puppies too early, it can actually be detrimental to their physical and emotional health.  For one thing, they may not be fully accustomed to a healthy diet, and can be too small and undernourished.  They also won’t have sufficient socialization with humans, and may be harder to place in a home.  Additionally, the mother might not be fully weaned from the litter, and can experience physical and/or emotional problems if she’s not weaned in a timely manner.
assistant
Puppies can be weaned too early, or fed a improper diet.  If pups are weaned before 8 weeks of age, they can be insecure, anxious, and distressed, and they might also experience health issues due to a premature weaning.  If they are fed a poor quality food before 8 weeks of age, they can be malnourished, and their immune systems can also be underdeveloped.  They can also pick up parasites from their mother before they are weaned.
assistant
At what age should puppies be weaned?
user
Ideally, young puppies should be weaned at about 8-10 weeks of age.  They should be fully accustomed to a high-quality commercial puppy food by this point.  This allows them to be more socially ready for adoption, and also helps them develop a healthier body.  Starting at a younger age also means they can be more readily acclimated to a human-sanctioned environment.  Weaning them later than 8-10 weeks might actually be detrimental to their physical and emotional health.  In addition, their mother should be completely weaned from the litter by 10 weeks of age.
assistant
Okay, what happens if I wean too early?
user