Dr. Brown's Natural Flow Original Wide Neck Baby Bottle, 4oz/120ml, designed for infants with oral feeding challenges related to immaturity and reduces the symptoms of colic, including spit-up, burping and gas. They are a tried and tested favorite with parents focused on helping their little ones experience happy feeding.

Preemie Nipple - Best nipple choice for newborns and/or infants who are receiving supplemental breast feeding

Level 1 Nipple ? The Level 1 nipple flow rate can be used for infants with a feeding skill maturity that does not require a slow flow nipple rate ? Ultra-Preemie? or Preemie level nipples. 60% faster flow rate than Dr. Brown?s? Preemie Level Nipple.

Level 2 Nipple  60% faster flow rate than Dr. Brown's Level 1 Nipple.

Level 3 Nipple  50% faster flow rate than Dr. Brown's Level 2 Nipple.

Level 4 Nipple  50% faster flow rate than Dr. Brown's Level 3 Nipple.

Features

• Dr. Brown's Natural Flow baby bottles address the symptoms of colic and digestive disorders, preserves vitamins A, C and E, as well as provides an ease of delivery for the most fragile infant population.
• Combination of the internal vent system and silicone nipples, designed to work together for a vacuum-less, controlled flow allowing infants to Reduce the infants energy expenditure by enhancing feeding performance without increasing sucking effort.
• Clear benefits for oral feeding challenges related to immaturity with the Dr. Brown's Vacuum-less bottle system.
• Fully-vented bottle design is closest to breastfeeding
• Proven to help preserve bottle milk nutrients that are critical for health in infancy