Bigger bottles for bigger appetites. The 8 to 11 ounce size takes over once your baby outgrows the 4-ounce newborn bottles — fewer refills per feeding as intake grows around three to four months. Look for the same trusted features as the smaller bottles: anti-colic venting, staged nipple flows, and easy-to-clean wide necks. New stock is on the way; orders over $50 ship free.