The Dr. Brown's Natural Flow Anti-Colic Preemie Bottles are designed for newborns and premature infants. This 2-pack of 2 oz bottles features a narrow neck design and an anti-colic nipple to help reduce colic and discomfort during feeding. Made from BPA-free plastic and silicone, these bottles are safe and gentle for sensitive baby stomachs. The clear color allows for easy monitoring of milk or formula levels, making them an ideal choice for parents looking for a reliable and efficient feeding solution. New open box , friend bought them and they were not the size she needed .