S.A.
Hi C.!
My youngest child, who's 4 now, was introduced to the sippy cup at about 6 mos. When we started feeding him the fruit and vegetable baby food, we gave him a sippy cup, with diluted juice in it. He still had his formula bottle in the morning and at night. As well as other mothers here, he took easily to the Nuby sippy cup, because he could hold it like he held his bottle. We kind of introduced him to the new foods and juice around the same time, but give each food at least 3-5 days before introducing a new food...as to look for allergies. Good luck!