Weaning from a bottle to a cup depends on your baby's need to suck and his ability to drink from a cup. A baby is usually willing to be weaned between 9 and 18 months. When your baby is 6 months old, you can start giving him an open-rimmed cup, but wait to completely wean your baby until he is about 9 months old.
You can put breast milk that you have pumped in the cup. You can also use formula in the cup. Use iron-fortified formula until your baby is at least 1 year old to prevent iron-deficiency anemia. If your baby is over 12 months you can use regular whole milk.
If your baby is taking a daily total of 16 to 20 oz. of milk by cup, in addition to 3 meals of solid food, and doesn't seem to miss the bottle, he can be considered successfully weaned.
Setbacks in weaning can be caused by many things, including stress, major changes in meal or bed times, or illness. If such setbacks occur, wait until the situation improves or the illness is over, and then continue the weaning process. Call your baby's healthcare provider if you have any questions or concerns.
If your child does have a sippy cup, use it only at the table or while your child is in the high chair. Children should not be allowed to walk around with a sippy cup. Carrying a sippy cup allows a child to get attached to it for comfort. Because calorie-rich drinks are usually in the sippy cup, the child learns that food means comfort. This is not a good idea. The sippy cup may be bad for teeth, both causing tooth decay and overbite of the upper teeth.