will he take that instead of his bottle? and if it comes down to it you might just need to let him cry. I know it sounds awful but sometimes that's what you need to do.
I have him on toddler formula bc he doesn't take whole milk well and he drinks 1 oz soft nipple soppy cup of formula all day. Then he snacks all day but I don't feel like that's enough
I'm doing the same. my daughter loves her bottle. no binky just a bottle. have you tried using the sippy cups that are shaped like a bottle but a nipple like a sippy cup