The Avent 2 Teats Natural Response T1 is a product designed for babies from 0 months. These teats are designed to mimic the natural shape and movement of the mother's breast, making it easier for baby to transition from breast to bottle. To use this product, simply place the nipple on the bottle and make sure it is snug. Then fill the bottle with the desired milk or liquid and offer the bottle to your baby. It is important to follow the manufacturer's cleaning and sterilisation instructions to ensure the safety and hygiene of the product.