Two-month-old infant calcium deficiency performance, this problem is worth paying attention to, the infant body calcium deficiency is first manifested in the skull, the skull becomes soft, the performance will be larger, pressure off the skull with ping-pong feeling, later the chest bone shape will also be abnormal, such as the sternum bulge like a chicken chest, or the lower edge of the two ribs will have an outward turning, if the lower limb bone is soft, after standing for a long time, after weight bearing will also If the bones of the lower limbs are soft, after standing for a long time, and after weight-bearing, it may also cause O-leg or X-leg. In addition to skeletal changes, early manifestations may also include excessive night sweating, occipital baldness, or children who sleep restlessly and are easily startled. These manifestations are also known as vitamin D deficiency rickets.