The nipple opening is designed to release milk only when the baby is feeding. So you can confidently avoid milk loss whether at home or on the go. The ergonomic bottle is easy to grip at any angle to give maximum comfort during feeding. Easy for your hands and tiny hands to hold. The wide, soft and flexible nipple is designed to mimic the shape and feel of a breast, helping baby to latch on and feed comfortably. The Natural Response Nipple works with your baby's natural feeding rhythm, making it easy to combine breast feeding and bottle feeding.