The manifestations of calcium deficiency in babies include neurotic excitability, growth retardation and decreased resistance. 1. Neurotic excitability: there are many symptoms such as easy to dry, easy to annoy, excessive sweating, self-sweating (involuntary sweating during the day, the slightest movement of sweating aggravated), night cries and other symptoms. 2. Delayed growth and development: late eruption of teeth, delayed language development and other symptoms, as well as delayed growth and development of walking, sitting and standing, and intelligence. 3. Skeletal deformities: common symptoms include X-shaped legs, O-shaped legs, chicken chest, etc. 4. Decreased resistance: it is easier to get colds, pneumonia, diarrhea and other diseases with low immune function. Severe calcium deficiency can easily lead to respiratory disorders, hand and foot convulsions. Calcium deficiency in babies should be given calcium supplements under the guidance of a doctor in a timely manner, while supplementing vitamin D, which can promote calcium absorption. For serious calcium deficiency resulting in other diseases should be timely medical treatment, as soon as possible to avoid aggravation of the condition.