May Be Caused by

 Common

Achondroplasia

Battered child syndrome

Hypothyroidism

Infantile hypothyroidism

Mucopolysaccharidosis

Niemann-Pick disease

Normal variant

Phenylketonuria

Scheuermann disease

Trauma

Werdnig-Hoffmann disease

 Uncommon

Adenosine deaminase deficiency with severe combined immunodeficiency and chondro-osseous dysplasia

Aspartylglucosaminuria

Diastrophic dysplasia

Dyggve-Melchior-Clausen dysplasia

GM1 gangliosidosis

Marshall syndrome

Mucolipidosis

Neurofibromatosis

Pseudoachondroplasia

Spondyloepimetaphyseal dysplasia short limb-hand type

Spondyloepiphyseal dysplasia congenita

Trisomy 21