Babies look a little like ants when they have a full crop. They have a protruding gizzard, which makes them bottom heavy and allows them to sit up and stretch their neck without falling over. Newborns and very young babies do fall over - they need their mother to weigh them down. Lacking that, we put them in a small, softly lined container that helps them to stay upright. Otherwise they spend much time struggling.
Babies can hold about twice the amount of food per gram of bodyweight that adults can hold.
It is a good indicator of the general health of the baby. Babies should be pink and the skin should be supple and soft. If the baby is red, it may be too hot, especially if it is also panting. If it is very pale, it could be so cold that it is near death, or it could be so sick it is near death. Droppings are more runny than those of adults since the baby has a more liquid diet.