STRAIGHT FROM http://www.worldofhummingbirds.com/baby.php: (This is a shortened version. Be sure to visit their website to read in full)
When a mother hummingbird is laying an egg, she can be seen sitting on her nest with some shaking alternated by wiggling every few seconds. Mother hummingbirds will usually have two eggs laid on different days. The little eggs will be about the size of a pea or small jellybean. Even though the eggs will be laid on different days, both the eggs will usually hatch on the same day. The mother hummingbird can do this by not completely starting the incubation process until the second egg is laid.
The hummingbird eggs will remain in the nest incubating for approximately 16-18 days before they hatch. If the weather is cooler it may cause them to hatch a few days later. While the eggs are incubating in the nest, the mother hummingbird will sit on eggs to keep them at a constant temperature of 96 degrees.
When the baby hummingbirds hatch, they have no feathers and dark skin. Baby hummingbirds are hatched with their eyes are closed. Depending on the type or species of hummingbird, the little babies will weigh approximately 0.62 grams. That's one-third (1/3) the weight of a United States Dime. They are about one (1) inch long and cannot regulate their own body heat. Their beaks are short, stubby, and yellow.
When the baby hummingbirds are first born, the mother hummingbird will spend most of her time sitting on the nest, keeping the baby hummingbirds warm. As the baby hummingbirds grow more feathers, they are better able to keep themselves warm and the mother hummingbird can spend more time catching bugs and drinking nectar to feed them.
The mother hummingbird will eat nectar and bugs and then regurgitate it into a slurry substance the baby hummingbirds can digest. She will feed this mixture to the baby hummingbirds approximately every twenty (20) minutes. A baby hummingbird needs the mother hummingbird to feed them. Baby hummingbirds can not drink hummingbird nectar like adults do because there is not enough protein in the regular hummingbird nectar. If a baby hummingbird had only regular hummingbird nectar, the baby hummingbird would become severally crippled, or would die. If you find a sick, injured, or abandoned hummingbird, please read our First-Aid for Baby Hummingbirds section first, before attempting to rescue them.
"Ask not what an animal can do for you; ask what you can do for an animal." Jasper
"The animals of the world exist for their own reasons. They were not made for humans any more than black people were made for white, or women created for men." ~Alice Walker
The source of the quote is Walker's preface to Marjorie Spiegel's 1988 book, "The Dreaded Comparison" . Her next sentence was, "This is the gist of Ms. Spiegel's cogent, humane and astute argument, and it is sound."