Thanks to the unique valve in the base, no vacuum is created when baby sucks. This ensures that the baby can be feed undisturbed and sleep longer and more peacefully afterwards. Unique S Shaped design encourages baby to lie in the recommended, natural curled position, which also increases the eye contact. The S bottle has also benefits for mum and dad. The S shaped design allows the feeding adult to sit in an ergonomically sound, relaxed position. There is less strain on the back and shoulders. Non spill cap with measurements and soft top for sucking on. Unscrewable base: easy to clean and easy to fill with breast milk frozen into cubes. Microwave, dishwasher and freezer safe. Products developed by Difrax.