Most cases have reported death at birth or shortly after. Numerous fractures and severe bone deformity is normal. Small stature with underdeveloped lungs. Collagen is improperly formed. Type three OI also has bones that fracture easily.
Fractures are often present at birth, they tend to be mostly of short stature.
Sclera has a purple, blue or gray tint. Loose joints and poor muscle development in arms and legs are common. Barrel shaped rib cage, triangular face, spinal curvature, respiratory problems are also possible. Bone deformity is often severe. The possibility of brittle teeth and hearing loss.