J.A.
They ususally start holding their own bottle around 6 or 7 months old. With my son, I would hold the bottle where he could see it but I wouldn't put it in his mouth, I would wait until he grabbed for it and then helped him guide it to his mouth and held his hands on the bottle while he drank, after a few times of doing this he was pretty good at grabbing it and holding it on his own. I think using the small bottles helps a lot too because they are easier for babies to hold and to tip up.