Avent feeding Bottles have a wide neck so are easier to fill and there is no messy spills. The self sealing cap ensures no leakage when mixing formula and is great for travelling. It has a wide anti colic teat for the baby to suckle on and it is just like the mothers breast. The Avent bottle will support your choice of feeding, whether supplementing breastfeeding with an occasional bottle of breast milk, or bottle feeding exclusively. The secret is the patented Avent teat, which resembles the natural form and feel of the breast, and the unique anti-colic skirt which allows the teat to function like the breast. This allows an easy transition for baby between breast and bottle. The Avent bottle gives you the flexibility you need to breastfeed, bottle feed or do both. The Avent bottle with its award winning wide-neck design, is stable and easier to hold, making filling and cleaning easy. Clear markings on the bottle ensure accurate measurement. Only the Avent anti-colic bottle and teat are clinically proven to reduce colic in the newborn. Can be used with variable flow teat 3m+ - bigger bottle for hungrier babies.