Innobaby"s Nursin" SMART Grow-with-Me Silicone Nursing System was developed by pediatric specialists and lactation consultants in 2004 and has been time tested over the years to provide an ultimate supplementary feeding solution from infant to toddler years. It is an easy and simple solution to parents wanting to overcome feeding challenges caused by transitioning from breast to bottle, colic babies, premature babies, and babies weaning from bottle to advanced feeding. Made with highest quality German made medical grade silicone, Nursin" SMART is noticeably soft, naturally elastic and ultimately safe. Feel the difference and experience the next best thing to breastfeeding. Natural Nipple is round, soft and replicates the areola. During feeding, both nipple and areola stretch together, promoting a correct latch on and having a baby to experience a similar feel as if they would in breastfeeding. Holes on the nipples are placed off centered. This is to mimic the natural breastfeeding experience in which the milk is released in various angles, not in a straight line. A baby must give extra suckling motion and pressure to start the milk flow as if they would in actual breastfeeding. Therefore, a baby would never respond to the milk flow but they would always be in control. Also, the benefit of extra jaw movement/exercise encourages healthy oral development. The shape, the length, and the softness of the nipple is designed to avoid "bottle feeding tongue"; therefore, prevents nipple confusion and prevents babies from inhaling extra air during feeding (with correct latch on).