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 mom’s 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. Based on 2021 study of 524 parents who use Tommee Tippee bottles Made for Moms March 2020