Philips Avent Natural Response Baby Bottle Nipple Flow 3 1m+ x2 is an innovative teat meticulously designed to mimic a mother's breast. For that purpose, it has a wide shape to promote a natural latch-on similar to the breast and is made of ultra-soft silicone to mimic the feel of the breast. As such, it makes it easy for the baby to transition or alternate between breastfeeding and bottle feeding. Furthermore, the flexible spiral design with comfort petals ensures the teat flexes and stretches in harmony with your baby’s natural feeding rhythm, guaranteeing a consistent and continuous flow. This natural response follows the rhythm of the baby as it drinks, swallows, and breathes like it happens when breastfeeding. Plus, the teat only releases liquid when the baby drinks, ensuring no spills or milk loss.