I'm not sure if there are studies that show they do or not, but if I had to guess, I would say so.One reason I do is because I use to babysit this baby (who is now

, and when she would sleep, she would squirm a little and then wake up crying. I never understood why, at the time anyway, because she wasn't hungry and didn't have to go to the bathroom. I now think it's because she was having bad dreams. In my opinion, I think babies are really smart; they just can't show it. Haven't you ever heard that if a baby doesn't keep their mind alert that they lose brain cells? I think I read somewhere that humans only use 10% of their brains, and most of our brain power/cells are lost as a baby because we do not use them.