For infants, a daily intake of 400 U of vitamin D is sufficient. Achieving this amount of 400 U is effective in preventing and correcting vitamin D deficiency rickets in children. When vitamin D deficiency rickets occurs in children, it often causes a range of symptoms such as occipital baldness, chicken chest, more sweating on the head, and poor sleep. This tends to jeopardize children’s health and can even cause deformities such as X-shaped legs and O-shaped legs. This is why it is clinically significant to give infants a daily supplement of 400 U of vitamin D. Parents should insist that this be done in order to prevent children from developing symptoms of calcium deficiency.