An abnormal restriction of fetal growth with fetal weight below the tenth percentile for gestational age.

A height below that which is expected according to age and gender norms. Although there is no universally accepted definition of short stature, many refer to "short stature" as height more than 2 standard deviations below the mean for age and gender (or below the 3rd percentile for age and gender dependent norms).

A decreased magnitude of the sensory perception of sound.

A failure to achieve the ability to walk at an appropriate developmental stage. Most children learn to walk in a series of stages, and learn to walk short distances independently between 12 and 15 months.

Developmental dysplasia of dentin.

The repeated occurrence of bone fractures (implying an abnormally increased tendency for fracture).

A pathologic entity characterized by a developmental defect in a long bone leading to bending and pathologic fracture, with inability to form a normal bony callus with subsequent fibrous nonunion, leading to the pseudarthrosis (or "false joint").

Reduced diameter of a long bone.

Abnormal thinning of the cortical region of bones.

The presence of bone fractures in the prenatal period that are diagnosed at birth or before.

A bending or abnormal curvature of a long bone.

A reduction of bone mineral density, that is, of the amount of matter per cubic centimeter of bones.

The presence of extra bones within a cranial suture. Wormian bones are irregular isolated bones which appear in addition to the usual centers of ossification of the cranium.

An abnormality of phosphate homeostasis or concentration in the body.

Any deviation from the normal concentration of calcium in the blood circulation.

A reduced level of osteocalcin in the blood.