I've been postponing this post for a long time since I was expecting the list to grow.
There are many things a baby doesn't know, like how to walk, sing, and do long division. Here is the list of things that my baby didn't know how to do which I wasn't expecting:
1. Sleep. I kinda knew this one. But my kid had to be taught how to sleep. I suspect he would of learned on his own given more time, however.
2. See moving object. When my son started to be able to see me, he could recognize faces. If I was in front of him, he'd pay attention. However, if I moved my head by a few inches, his eyes stayed affixed to my previous location for at least a second. Once I stopped moving, he would notice out of the corner of his eye a face and then turn to my direction and look again. It's like I didn't exist when moving, but once stopped a new me materialized.
3. Binocular vision. This one was cool and it was exciting to see him change. Even when my son could see me, he often only looked with one eye, or perhaps one eye first and then the other. While one eye looked at me, the other was free to wander and see other things. Over time, he learned to move both at the same time and converge on the me he wanted to see. I don't know if he can see in stereo yet, but he can certainly judge distance. And I suspect that he could have learned to use both eyes independently like a chameleon, but the advantages of stereopsis and binocular summation are too enticing.
4. Left/right independence. When my son could first grab things, he used his right arm. Then he tried his left. I could see him intently trying to acquire the toy but every time he tried to move his left arm, the right one would go instead. If his left hand was in the right position, his right hand would make a grasping motion. It's like his brain had learned how to do a "grasp" but didn't know there was a "left grasp" vs. "right grasp" yet. The little guy got it eventually; he did try really hard.
And that's it. Everything else you'd expect.
My son never really cried until last week when he saw a baby cry and get lots of attention; now he does it frequently. So I guess learning to cry is another one.
