People with achondroplasia have a range of characteristics, including:
- a near normal trunk length with shorter arms and legs
- a large head with prominent forehead and flattened bridge of the nose
- an increased curvature of the lower spine (lumbar lordosis)
- bowing of the lower legs
- crowded teeth, in some cases
- short, broad feet and hands with separation between middle and ring fingers (known as the 'trident' hand)
- flexible joints.
Babies with achondroplasia may develop their motor skills (the ability to use and co-ordinate the muscles in their body) and mobility more slowly than normal because of the combination of a heavier head and shorter arms and legs, but ultimately their development should be within the expected normal range.