@maryannpena13, use the same bottles but nipples are instead sippy nipples. Nuk has them dat way he still had the same bottles but sippy-like nipples ! Then change to all new sippy cups or straw depending which one cub likes!
I started at four months old I used both but bottle at night only n sippy the day n at 13 months old I went cold turkey n threw them all out n that’s how I did it... how old is the kid ??
I have tried several sippy cups. I started first with a basic one and I would drink out of it when he was watching. I had to take the little plastic thing out from the lid so the water flowed easier and then would give it to him like that, more of me tilting it to his lips and watching the water spill out haha but over the past month he became more interested. He loves the tommy tippy sippy cup because the opening is almost nipple like.
Then we had a break through with the 360 cup. I had to press on the lid the first few tries to show him water comes out. Now he is loving it.