No matter how safe the bottle, small infants should never be left unattended to feed themselves. Tooth decay is also encouraged when a baby is left for an extended period with any bottle. In general, loving human contact is vital to an infant's secure development. A baby is always close and supervised while breastfeeding and likewise should be held while bottle feeding. The recessed tip serves two functions.
Many bottles leak when in transit.
Some manufacturers have provided a small cup on the inside of the dust cap to overcome this problem. However, this creates an unsuspecting environment for bacterial growth. The Breastbottle nurser's nipple provides a more positive seal and the dust cover is easy to keep sanitary. The recessed tip also provides an inner rib to keep the nipple from pinching closed and offers what is believed to be a more natural sensation at your baby's palate. We have avoided using these materials until we are absolutely certain that they pose no health hazard.