Hi all, LO is 12mo and is BF and I supplement with formula. He only nurses at night now. Trying to introduce whole milk and it’s not going well. It’s been three days but I am worried! He drinks water from his sippy cup but throws it at times. Still takes the bottle. I tried mixing formula with whole milk but he won’t take it. It was cold. I dont know if I should try warming it but I dont want to start that since he won’t have it like that most of the time. Thoughts please?! Thank you!