Question
My son is 4 months old and occasionally has head and arm movements (or tremors, shakes) while breastfeeding. The arm tremors resemble adults shivering in the cold, while the head moves slightly back and forth at a similar frequency, lasting for tens of seconds.
Answer
Full-term babies should start taking 400 IU of vitamin D daily from 15 days after birth to promote calcium absorption. Failure to do so can lead to symptoms of calcium deficiency. Excessive sweating, restless sleep, easy to be startled, and bald patches on the pillow are typical manifestations of calcium deficiency. If these symptoms occur, it is important to go to the hospital for a trace element test to determine if there is a deficiency and its severity. If confirmed, calcium supplementation treatment is required.