It is not recommended to put the milk sucked out twice at room temperature together as it will affect the quality of the milk and it is recommended to store it separately. Milk sucked out at room temperature is rich in protein, fat and trace elements as well as vitamins. Generally, milk squeezed out at room temperature can only be kept for 2 to 4 hours, and the refrigeration time is usually around 24 hours. If the milk is put together at room temperature, it is easy to harbor bacteria, which will cause the milk to spoil and affect the child’s digestive tract. It is recommended that milk from two sucks at room temperature be stored separately, and the bottles should be labeled and time stamped. When feeding your baby, you need to heat up the bottles one by one in the order of the label before feeding your baby. However, parents should always keep the milk from the two aspirations separate to prevent spoilage, and it is not recommended to store breastmilk for too long.