What is the cause of a child of about 2 years old, who presents with calf exstrophy, with chicken chest and square skull, and usually cries easily?

Usually at the age of 2 years, physiological calf ectropion will appear, but there are mostly no other accompanying symptoms. If the patient is combined with chicken chest and square skull, it is considered to be related to systemic ossification disorder, combined with the appearance of irritable crying and other symptoms, it is mostly considered to be related to rickets, and early medical consultation and treatment is recommended.