Full-term babies should start taking 400 IU of vitamin D daily from 15 days after birth to promote calcium absorption. If not supplemented on time, it can lead to symptoms of calcium deficiency such as excessive sweating, restless sleep, easy waking, and bald spots on the head. If these symptoms occur, it’s important to go to the hospital for a trace element test to check for calcium deficiency and its severity. If diagnosed with calcium deficiency, treatment is needed.