My son is 13 months and we are in the progress of weaning (it is a family decision we are okay with) and switching to whole milk. He has not had a bottle since June 4th and is only nursing morning and night. He does not seem to like whole milk. I can now get him 8 oz a day in cereal, and maybe a few sips from his sippy cup, but that's it. He has been drinking water out of sippy cups since 6 months. I have also tried other sippy cups. Any ideas?