My toddler has tried almost every cup made to get him off of his favorite one (Nuk brand) which caused a severe overbite for his little toddler mouth. Now since I have found this cup he loved it right away! Usually he gets mad when you have to suck hard for the drink to come through the straw, but this cup is so easy to drink from. Wish he would've had this a long time ago. I even bought one for my 7 month old to use and he latched on it right away as well. Great product overall!