Collagen improperly formed, enough collagen is made but it is defective
Bones fracture easily, sometimes even before birth
Bone deformity, often severe
Respiratory problems possible
Short stature, spinal curvature and sometimes barrel-shaped rib cage
Triangular face[6]
Loose joints(double jointed)
Poor muscle tone in arms and legs
Discolouration of the sclera (the 'whites' of the eyes are blue)
Early loss of hearing possible
Type III is distinguished among the other classifications as being the "progressive deforming" type, wherein a neonate presents with mild symptoms at birth and develops the aforementioned symptoms throughout life. Lifespans may be normal, albeit with severe physical handicapping.