Babies are born with many skills, and have to learn many as well. There are, I believe, five major reflexes babies have at birth. Grasping, stepping (if you hold them with their feet dangling just above the floor, they'll attempt to walk in the air), some reflex named after some person that happens if you touch their feet, touching their cheek makes them turn their heads in that direction (for breast feeding), and a few others. Obviously they can breath and do all the other things that is automated by the brainstem (or whatever part that is prior to the brain; been over a year since I learned this).
And many or most things they learn through mimicking their parents. The environment teaches you many things. Mostly social behaviors.