1. Wash the milk utensils before sterilization. Wash the milk stains, then brush with detergent and rinse with water. 2.Simple home sterilization method: Boil milk utensils in boiling water for 10 minutes, then cool them down and take them out for use. 3. Wash your hands before dispensing milk. Do not touch the inside of the bottle or the teat during the process to avoid contamination. 4. Pour an appropriate amount of warm boiling water at 50-60℃ into the bottle before dispensing milk (some bottles have inaccurate scales, so you can measure the error with a measuring cup before using it for the first time. Gently shake the bottle until all the milk powder is dissolved. 5. Do not feed the unfinished milk next time. Because the milk in the bottle has been contaminated, the bacteria will grow geometrically after a few hours to the point where it can cause disease. What should I do if I have leftover milk? Don’t let your child drink it, and don’t leave it for the next meal. The next time you prepare milk, what if you can prepare it according to your baby’s needs, taking into account his or her food intake? Then congratulations, you are really learning to prepare milk for your own child.