(1) Single diet: mainly milk, including human milk, milk and goat milk. The proportion of calcium and phosphorus in human milk is suitable for infants to absorb, but calcium is less. If you simply feed with human milk and do not pay attention to adding complementary food, calcium intake is insufficient, and calcium deficiency symptoms are prone to occur.
(2) The demand for calcium is large: infancy is the fastest growing period in a person's life. The development of skeletal system needs a lot of calcium. If the daily intake of calcium is less than 6.00 mg, calcium can not meet the needs of growth, and there will be calcium deficiency such as beaded ribs, "X" or "O" legs.
(3) Reduced calcium absorption: In recent years, with the urban construction, there are more and more high-rise buildings, and children's chances of receiving sunlight are reduced, and their own vitamin D3 is insufficient. Vitamin D3 can promote the absorption of calcium, and the reduction of vitamin D3 will inevitably lead to the reduction of calcium absorption.
(4) Insufficient calcium reserve: the mother is short of calcium during pregnancy, and the baby is short of calcium reserve after birth, especially premature and multiple pregnant babies, which are prone to night terrors, hyperhidrosis and other calcium deficiency symptoms. Calcium deficiency must be supplemented in time, otherwise it will affect children's development and health.