My DS2 weaned at almost 11 months, I was so upset! I wasn't ready, I wanted us to make it to 12 months, but he just didn't want it any more and flat-out refused me. He was well established on solids and my MCHN told me to just start giving him cows milk.

My DS1 weaned at 6 months, but this was because I had been topping him up with formula from 4 months of age as I didn't seem to have enough BM to satisfy him (wish I'd known about BB and the ABA back then) and he eventually just wanted the bottle because it was quicker.

So yes, some babies do wean before 12 months of age