Twin Bond

Mine were the same at that age.. nearly 11 months now and they certainly acknowledge either other now. Wrestle, hold hands, pull eachothers ears and hair. When one plays and does something funny the other will laugh and copy. They splash eachother when in the bath etc.
When they were around 6 months I did wonder when they'd start paying attention but now they have some lovely moments playing together which gives me a few minutes of rest.

I feel like they really started interacting closer to 1. They did on occasion acknowledge each other before. They had a hard time sleeping apart.
Now at 2.5 they are inseparable. I have b/g twins I’m hoping that bond will last!

Mine didn't start interacting much until closer to 18 months. Now they are almost two and a half and constantly play together and fight lol

Probably as they get more aware around them. I’ve seen it some babies were in the like same placenta and were right next to each other then they might only from being used to like how they sleep. But kids don’t really start to do anything or acknowledge anything until like closer to 1 or later.