Tiny Tummies Feeding Milestones: Checkpoint For more information and helpful tips about this topic, you can visit our Resources section. At what age should my baby use a cup instead of a bottle? At birth 3 months old 6 months old 1 year old Not quite. Most babies should begin using a cup instead of a bottle around 1 year old. Not quite. Most babies should begin using a cup instead of a bottle around 1 year old. Not quite. Most babies should begin using a cup instead of a bottle around 1 year old. Yes! It’s best to transition your baby from a bottle to a cup around 1 year of age. Back Next