Symptoms and manifestations of calcium deficiency in one-and-a-half year old babies include neurotic excitability, growth retardation, and decreased resistance. 1. Neurotic excitability: easy to dry, easy to annoy, sweating, self-sweating (involuntary sweating during the day, the slightest movement of sweating aggravated), night crying and other symptoms. 2. Growth and developmental delay: there are growth and developmental delays in 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 have colds, pneumonia, diarrhea, and other diseases with low immune function. Severe calcium deficiency can easily lead to respiratory disorders, hand and foot convulsions. One and a half year old baby appeared the above performance is recommended to consult a doctor in time, under the guidance of the doctor to give calcium supplements, at the same time to give supplemental vitamin D, can promote calcium absorption.