Usually called rickets, is vitamin D deficiency rickets, divided into four stages: 1, the early stage that is early is generally in about six months began to appear; 2, the active stage, can be manifested as skeletal deformities, this will be found in the baby appear square skull or ping pong-like softening of the skull, a press baby’s head will be found like a ping pong ball, you can press down and then pop up, of course, there is a certain risk, parents are not recommended to carry out Such examination methods; wide fontanel, occipital baldness, for the chest, can appear chicken chest, funnel chest, Hao’s groove, rib edge exostosis, for the lower limb limbs can also be manifested as bracelet sign, ankle bracelet sign, O-leg, X-leg, and even spinal deformity, and some will cause pelvic impact; 3, if after regular treatment, to the recovery period, the skeletal changes can be slightly better; 4, but once the skeletal abnormalities occur there are often distant sequelae manifestations, i.e. skeletal abnormalities in the posterior period. Therefore, effective vitamin D supplementation is recommended in the initial stage.