M.W.
My daughter would not drink milk out of anything but a bottle and my husband refused to keep the bottle around after she turned 1. I didn't mind as much. When I mentioned it to the pediatrician he said it's ok as long as she gets calcium from other sources - cheese, yogurt etc... I wouldn't worry too much about it. Sometimes it's hard to go from mom to cup and takes time. It doesn't mean you're failing, it just means he loves you more. Keep trying and good luck!