C.R.
Hey Beth!
I started my daughter on a sippy cup at 6 months, the soft topped ones, like a bottle. Then moved on to the harder topped ones, after three months and then only a bottle at night. On her birthday, that was her last bottle. My advice, since the girls are still drinking with bottles, put water in the bottles. Give them the juice or milk in the sippy and the water in the bottle. They will soon find out which one they like better! Good luck and email me when you have extra time!