Health Canada recommends that babies be fed breast milk exclusively until six months, at which time they are developmentally ready to supplement with different foods and modes of feeding.1 A sippy cup may be introduced from six months on, given your baby is able to sit up on his own. To transition to a sippy cup, your baby needs a strong grasp and hand-eye coordination, which he has been practicing over the last two months. This generally coincides with the introduction of solid food.