Generally bottles need to be sterilized by boiling at high temperature after each use to ensure the cleanliness of the bottles. Because bottles are a tool for feeding babies and toddlers, if they are not properly cleaned and disinfected, they can easily cause indigestion, enteritis, etc. If bottles are not cleaned after use, the residual milk will deteriorate in about 2 hours, so it is important to clean the bottles promptly after use and sterilize them at high temperature, and then put them away to avoid contamination and keep them ready for use. It is also generally best to disinfect unused bottles once a day, which can be done by boiling at high temperature for 10-15 minutes. It is recommended that parents choose quality-assured bottles, because poor-quality bottles may release toxic substances after high-temperature boiling sterilization, which is, in turn, more detrimental to the health of infants and children. In addition, it is recommended to replace the bottle once in about 3-6 months.