9 months

Sit independently without support
Get themselves into a sitting position (though not all yet!)
Roll confidently both ways
Move around somehow — crawling, bum shuffling, commando crawling, or wriggling
Bear weight on their legs when held standing
Some may start pulling themselves up on furniture

I think from about 4 months onwards but not responding consistently until about 9 months. My baby knows his name very well but literally ignores us when he's busy playing / when he wants to even when we get in his face lol He's just cheeky but I remember to help him learn his name we had to stop all the cutesy nicknames we had for him now we can use his proper nickname and he responds as well as to his full name.

We have an app called pathways that’s been super helpful with tracking milestones. https://pathways.org/mobile-app