My son was so easy to transition from formula and a bottle. One day I put milk in his bottle and he acted like he didn’t even notice. The next week I put it in a sippy cup and again, he acted like he didn’t notice. I was shocked because so many people had warned me of the ordeal that was transitioning from bottle to sippy cup and from formula or breast milk to milk. Going through it again now with Sophie is completely different. She yells and crys until she gets her bottle every night. She will not go to sleep unless she gets it and she refuses to drink it if it’s regular milk. She has been a lot tougher to break of these habits. She does great with a sippy, but when it comes for bedtime, she wants that bottle.