The Evenflo Feeding Balance + Wide Neck Nipple was created with Pediatric Feeding Specialists to facilitate proper bottle feeding without interfering with your breastfeeding journey. The naturally slanted nipple encourages a healthy broad latch for your baby by giving an appropriate resting space for their lips, reducing mouth fatigue. With no unnecessary components to clean or lose, the effective 1-piece integrated vent helps avoid colic, gas, and fussiness. The slower flow rate reduces chugging and allows for a relaxed, gulp-free feeding at baby's pace. One Balance + Wide Medium Flow Nipple (3-7 months) and one Balance + Wide Fast Flow Nipple (8+ months) are included in this combo box so you may choose the ideal flow for your infant. Your infant collapses the nipple during a feeding, starts fussing with the bottle, unlatches and re-latches throughout the meal, acts agitated, chews or tugs on the nipple, and/or sucks multiple times before swallowing are all signs that it's time to shift to the next flow nipple. The Nipple for the Balance + Wide Neck Bottle is compatible with the Nipple for the Balance + Wide Neck Bottle. BPA, polycarbonates, PVC, and phthalates are all absent from Evenflo Feeding nipples.