I can't remember when my twins starting interacting with each other but it was certainly when they were well over a year and that was to fight over a toy! My two are now 6 and play with each other most of the time at home. Give it time, but don't expect much interaction for quite a while
Yes, what colditz said, I think some people think that twins will just interact with each earlier just because they're twins. My sil used to think they looked after each other, kept each other amused at 6 months.
It's normal, don't worry. The big wide world is a new and exciting place, their twin has always been there, so not so exciting. I can't remember when my 2 started interacting with each other, but I think it started with them playing peek a boo with each other or laughing at each others laughs, then they would ignore each other for another week or so. They are very close now, I don't think they will ever be best friends though, they're more like an old married couple. Beware, once the interaction starts the fighting follows
My twins are 8.5m, 7 adjusted. They're still not bothering interacting, beyond the briefest of shouts. They'll happily claw each other while feeding etc but put facing (at an angle, so as to encourage relaxed conversation) they just turn away and look at anything else! They're noisy and babbling at everyone else. Maybe they just find each other boring? Everyone told me by a few months they'll be best friends . They don't seem to take any comfort in the others presence either. Is this normal? I've been so looking forward to seeing them entertain each other, if only so I can load the washing machine without them missing me!