Lactase is to help babies digest the lactose in food, and the highest lactose content is in breast milk and formula milk such as cow’s milk and goat’s milk, so special attention should also be paid when taking lactase. The effective time for lactase to work in the body is within 1 hour, and you should take lactase once every 2 hours or more between breastfeeding or cow’s milk feeding, there is no specific rule on how many times a day you should take it. There is no specific rule on how many times a day you should take lactase. If you feed your baby only once in more than 3-4 hours, the number of times you should take lactase is relatively small. If your baby eats milk more often, take lactase relatively more often. When taking lactase it is important to note that if the baby is breastfed it should be taken 5 minutes before breastfeeding. For milk-fed babies, lactase can be put into the milk and taken together. Lactase should be dissolved in water below 37°C and then taken.