The phenomenon of rattling of bones when holding the baby is not caused by calcium deficiency in most cases, but by the friction of cartilage, synovium and ligaments in the joints when the patient is moving. If the baby does not feel any pain in the joints after the rattling, or the range of motion of the joints becomes smaller and other clinical manifestations, this is physiological rattling, without taking special treatment. If the baby feels pain in the joints after the rattling, or the range of motion of the joints is reduced, this is a pathologic rattling, and symptomatic treatment should be taken. Prohibition of activities in the joints or hot compresses can significantly alleviate this phenomenon, in addition, if you suspect that the baby is deficient in calcium can be tested through blood tests, you can see whether the baby is deficient in calcium.