It is generally recommended to sterilize baby bottles until the baby is about 12 months old. This is because babies' immune systems are still developing during their first year, making them more vulnerable to germs and bacteria that could cause illness. The UK National Health Service (NHS) and other health authorities recommend sterilizing bottles and feeding equipment for the entire first year of life. However, the Centers for Disease Control and Prevention (CDC) in the U.S. recommends sterilizing at least daily until the baby is 3 months old, and continuing longer only if the baby is immunocompromised or in special situations such as illness or water contamination. After 12 months, babies typically have stronger immune systems and produce antibodies to resist common germs, so sterilizing becomes less crucial. At that point, thorough washing with hot, soapy water or using a dishwasher sanitize cycle is usually sufficient. Sterilizing remains important if bottles have been unused for over 24 hours, if the baby is sick, or if water quality is uncertain. In summary:
- Sterilize bottles daily until 12 months old per NHS and many expert guidelines.
- CDC recommends at least until 3 months, longer if baby is immunocompromised.
- After 12 months, thorough washing is generally enough since babies' immunity improves.
- Sterilizing may still be needed in special cases (illness, water contamination, etc.).
This guidance helps protect babies from bacteria and infections commonly associated with milk residue in bottles while their immune system is maturing.
