Medium flow works best with infants 4-12 monthsnCompatible with all Medela breast milk bottlesnMay be cleaned in the dishwasher, micro steamed, boiled or washed by handnMade without BPAnSlow and medium flow availablenMedela wide base silicone nipples are available in slow and medium flow for feeding newborns and infants. Features: Each pack contains 3 nipples. Natural feel and shape complements breastfeeding. Compatible with all Medela breastmilk bottles. Dishwasher and microwave safe. Medium-Flow Wide Base Nipples for 4-12 Months