The right size for newborns and young infants. Dr. Brown's Options+ 4-ounce bottles come in wide-neck and narrow three-packs with the internal vent system that reduces air bubbles. Philips Avent Natural 4-ounce bottles use Natural Response nipples that let babies pace the flow, and the anti-colic line adds the AirFree vent to keep the nipple full of milk. Stock a few — newborns feed often — and remember orders over $50 ship free.