Being nearly four years old, she was certainly a child: and children are human (if one allows the term "human" a wide sense): but she had not altogether ceased to be a baby: and babies are of course not human--they are animals, and have a very ancient and ramified culture, as cats have, and fishes, and even snakes: the same in kind as these, but much more complicated and vivid, since babies are, after all, one of the most developed species of the lower vertebrates. In short, babies have minds which work in terms and categories of their own which cannot be translated into the terms and categories of the human mind.It is true that they look human--but not so human, to be quite fair, as many monkeys.Subconsciously, too, every one recognizes they are animals--why else do people always laugh when a baby does some action resembling the human, as they would at a praying mantis? If the baby was only a less-developed man, there would be nothing funny in it, surely.
Humans have evolved levels of cooperation that are unprecedented among primate species. You can see it even in babies. Say you are playing with a baby and begin to put the toys in a box. If you point to one of the toys, the baby is likely to put it in the box (Liebal et al. 2009)... Human babies are more likely than other primates to follow another’s pointing or gaze. Thus, even before adults have socialized them, babies show tendencies to be in sync with the social behavior of others, to infer others’ intentions to cooperate, and to prefer cooperation in others.
We've hired the calmest babies in the world to play the hysterical Thomas. One did finally start to cry but stopped every time Chris [Newman (assistant director)] yelled 'Action'. ... Babies smiled all afternoon. Buddhist babies. They didn't cry once. We, however, were all in tears by 5 p.m.