Calcium is an indispensable trace element in the human body. Calcium deficiency makes it easy for babies to fall asleep, and even if they do, they will sweat a lot, wake up easily, cry, be irritable, have late teething, and be late toddlers. In the long run, it will seriously affect the baby’s health. So, how to give your baby calcium? I. Milk. In daily life, the main source of calcium is still through dietary supplements, milk and milk products, soy and soy products, shrimp, shrimp, sesame paste, etc. Second, calcium products. If the amount of calcium in food can not meet the baby’s needs, it is necessary to give the baby additional calcium preparations. The best when the calcium carbonate. Third, cod liver oil. Calcium absorption needs the help of vitamin D, cod liver oil that is rich in vitamin D, so infants and young children can take cod liver oil orally, the amount of prevention is 400 international units / day. In addition need more sun exposure, exposed skin as much as possible, the skin in the sun’s ultraviolet radiation, can produce vitamin D3.