Colic in infants may be caused by a mix of factors, including ingesting air during feeds. The Advanced Comfort; range is specially designed to help reduce air bubbles in the milk and encourages a good latch-on. The air vents down through a tube into the air-space at the base of the bottle, completely bypassing the milk. Capacity 260ml. 4 pack. BPA free. Anti-colic. Wide neck bottle. Slow flow teats. Tommee tippee advanced comfort; bottles provided optimum venting during feeding via a unique tube and valve system. They also help provide a continual feeding action via an easy-latch-on teat. The breast like shape of the closer to nature teat allows baby to latch on easily so there is less risk of air being taken in during the feeding process. This further supports the transition between bottle and breast. Revolutionary soft silicone teat developed with breastfeeding experts and mums, feels like skin and gently elongates and flexes during feeding to mimic natural breastfeeding action. Advanced comfort bottles makes feeding time easier for mum and baby. The compact shape of advanced comfort bottles allows baby to feed in a natural position and to be closer to mum or dad. The easy hold bottle can be held in 3 ways--cradled comfortably in the hand, gripped in the same way as a traditional wide neck bottle, or held from the base--making feeding comfortable for everyone. Advanced comfort bottles and teats are easy to clean and fill. They are microwave and dishwasher safe, yet light and easy to hold. The easy hold bottle is marked in millimetres and ounces and has a hygiene seal cap to keep germs out and drips in.