Your feeding method determines how many bottles you should keep on hand: Choosing the Best Baby Bottle For Your Family - BIBS
When choosing baby bottles, the primary sizes you'll encounter are and 8–9 oz (240–270 ml) . Most parents start with smaller bottles for newborns and transition to larger sizes as the baby's appetite grows around 3 to 6 months. Bottle Size by Age Baby's Age Recommended Bottle Size Typical Intake per Feed Newborn (0–3 months) 4 oz / 120–150 ml 1–3 oz (30–90 ml) Infant (3–6 months) 8–9 oz / 240–270 ml 4–6 oz (120–180 ml) Baby (6–12 months) 9–12 oz / 270–330 ml 7–8 oz (210–240 ml) How Many to Buy what size baby bottles to buy