at how their feathers have grown in! Their eyes are bright and alert,
and they look just about ready to fledge. They weigh about 4.0 grams
today. They weighed 0.5 grams when they hatched. So in about 16
days, they've become 8 times bigger!
Q: If a human baby weighed 7 pounds at birth and grew as
fast as a hummingbird, how much would that baby weigh at 16 days
(Answer below photo.)