This bottle set for newborns is good as an initial set for feeding and soothing. With the Natural Response teat, the baby can drink at its own rhythm, just like when breastfeeding, making it easy to combine breastfeeding and bottle feeding. The Natural Response teat only releases milk when the baby is actively feeding. This allows the baby to suck, swallow and breathe in its natural rhythm - just like when breastfeeding. This makes it easy to combine breastfeeding and bottle feeding. The design of the wide, soft and flexible teat imitates the shape and feel of the breast so that the baby can drink comfortably. The anti-colic valve reduces colic and discomfort by preventing air from entering the baby's tummy during feeding. The opening of the teat is designed so that milk is only released when the baby is actively drinking. This means that no milk is spilt either at home or when travelling. Every baby has its own drinking rhythm. The optimum feed flow depends on how quickly or slowly the baby feeds. A slow feed flow is suitable for active, fast drinkers. A fast feed flow, on the other hand, is suitable for slow and constant drinkers. Philips Avent Natural Response bottles and teats are made from BPA-free material.