V.F.
With my first, i did one week of 1/4 milk to 3/4 formula, then 1/2 and 1/2, then 3/4 milk and 1/4 formul, then by the 4th week we had full milk.
My second no problem she was on milk around 10 months, maybe closer to 11.
I would give them a sippy cup. Babies should be off bottle by 1 year. ( My first, i gave her a nighttime bottle till her 3rd birthday, big no no)
My second was off of bottles by her first birthday, or soon after.
Good luck!!