A.S.
I agree with the last person....13 months is a bit young, it is not a big deal. I don't think my son was off the bottle till 16 months, and he nursed much longer than that. If it is a dr. that is giving you this pressure, take what they say with a grain of salt. They are not all knowing. Just continue to give them a sippy at meals, and give the milk when they want it in a bottle. They will get it eventually. I know I had to put warmed milk in the sippy for the first few months after the bottles stopped and gradually I just made it less and less warm and then he adapted. Good luck!