MEDIUM FLOW NIPPLE FOR BABIES 3 MONTHS +n3 HOLEnSILICONEnREDUCES COLICn2 MEDDIUM FLOW NIPPLESnMade of silicone, the Avent Nipple feels softer and more natural than conventional rubber nipples, yet holds up much better to repeated washing and heat. The laser-cut holes do not change in size over time and precisely regulate the flow of liquid at every feeding.