Baby milk powder is recommended to be finished within 2 hours after brewing, if more than 2 hours, it is not recommended to continue drinking. Both imported and domestic milk powder are high-protein, high-nutrient foods, which are prone to deterioration and even bacterial growth after 2 hours at room temperature. If infants continue to drink it, it may not only stimulate the gastrointestinal function of infants, which is not yet well developed, resulting in indigestion, but may even induce intestinal inflammation, which is not good for infant health. In addition, if the formula contains probiotics, prolonged placement may also affect its activity, making its nutritional value greatly reduced. Therefore, milk powder should be brewed and drunk now, especially during infancy, to prevent adverse effects on the gastrointestinal tract function of infants, fever, abdominal pain, diarrhea and other symptoms.