My son, Christopher, began drinking out of sippy cups when he was 7 1/2 months old; We first bought Advent "Magic Trainer" Cups... He hated their handles, so we never used them... And he grew mighty fond of these cups... But a month or so later, I was disappointed. Not only were those cups hard to clean, but they became leaky... So I set out on a sippy cup seach, buying cup after cup. Until I found Gerber... My son loved these colerful cups. They're easy to hold for him, and easy to clean for me! I was quite impressed =)!!! And, as a fellow Mom, I'm sure you'll love to know that these cups are...