6.5 month old has newly started rocking himself back and forth (sometimes only head) when he is standing on my lap / on his tummy.

Is this normal?

Sometimes even hits his head in my shoulder and neck when he rocks that way.

I see a <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow App</a> Milestone , can rock back and forth . Is that the same ?