There’s almost nothing that can’t be faked. So, I concede this could be a fake. But, I just can’t see anything that is unexplainable in this video. (For example, that the baby “keeps drawing” at the 7 second mark: so what? He is in the process of drawing, knows what he wants to draw, is momentarily distracted, but keeps drawing the line from kinesthetic memory. His brain knew what he was doing. He didn’t need to be watching the pen at that moment.)
If this is a fake, what is faked? The drawing is real, right? If it is a fake hand it must also be a fake baby? Yet the baby seems pretty real, leading me to believe it’s a real hand. Whatever it is, a real baby or a real deepfake, it’s well done. I was particularly impressed by his ability to draw a perfect circle: that’s quite difficult for an adult!
OK, I just watched the second video. This is real video of a real baby. Deal with it, y’all.
This video is a series of spliced together 15-second TikTok videos, no? Couldn’t this just be a dropped frame or an artefact of the reassembling process? I agree frame 3:10 looks weird, but so do things like this:

(Obviously I’m not saying it’s the same phenomenon - the baby’s arm probably isnt spinning at 15000 rpm - but artefacts can happen while recording or rendering a video.)