When you use baby bottles, you don't have to sterilize them every time. For the first few months, you can sanitize every day, but as your baby grows, you will only need to do it occasionally. The CDC recommends that you sanitize your baby's bottles daily if he or she was born prematurely, has a medical condition, or is less than 3 months old. It's best to consult your pediatrician about this, depending on your baby's health status. It's important to clean your baby's bottles and nipples in a separate tub or basin (so they don't touch the sink), using a baby bottle brush. You should thoroughly rinse them with warm water and let them air dry without using a towel. You can also use the dishwasher with a special basket for all bottle parts.