It's hard to separate out what is a lack of strength or coordination and what is random trial. When babies learn to do basically everything, they do a tremendou

It's hard to separate out what is a lack of strength or coordination and what is random trial. When babies learn to do basically everything, they do a tremendous amount of random flailing that gradually (over weeks or months or years) resolves into the thing they're trying to accomplish. I think some people interpret this as babies just becoming strong enough to do things they innately know how to do, but with my 4 children, it's always struck me as learning through trial and error, like the neurons and muscle fibers gradually form in a way that is something like the average of all the ways they tried to achieve a goal. That's just my perception, of course. But then I also agree that babies seem to come pre-programmed with a desire to attempt a whole bunch of things. Like I said, I think it's very difficult to separate these things out!