Help

How do you respond when he does it? Do you run over and scoop him up? Do you shout? Is your worry obvious? If he isn't actually hurting himself you could probably ignore it. Or get a playpen and every time he does it lift him without comment and set him in so he's safe and then ignore him for a minute or two.

How long has he been doing it for? and do you have any other concerns with any of his development? meeting milestones in time? has he started to point to share interests yet? etc.

His speech is good. He just does it every time he goes near something hard. He even started to do it on my knee the other day. Don't think it's frustration cause he does it all the time

When's he doing it OP? Vis it in frustration? If so, how's his speech?