Loved by moms and babies, our award-winning**, easy latch-on, breast-like nipple feels closer to skin and mimics the natural flex and movement of a moms breast for a comfortable feed. 95% of moms reported that their baby accepted the soft silicone nipple with skin-like feel and would recommend to others. * All Closer to Nature bottle nipples feature an anti-colic valve to prevent the symptoms of colic by ensuring your little one ingests more milk and less air. Which flow rate do I need? We offer different flow rates to keep up with your growing baby. Every baby is different but as a guide we suggest slow flow for 0+months, medium flow for 3+ months and fast flow for 6+ months. Closer to Nature nipples are only compatible with Closer to Nature bottles. How often should I replace the bottle nipples? We recommend changing your bottle nipples every two months and you should change them immediately if they’re damaged or weak.