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https://www.healthline.com/health/achondroplasia#height

https://rarediseases.info.nih.gov/diseases/8173/achondroplasia

https://ghr.nlm.nih.gov/condition/achondroplasia#inheritance

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In more than 80 percent of cases, achondroplasia isn’t inherited

Infants born with homozygous achondroplasia are usually stillborn or die within a few months of being born.

The average height for adults with achondroplasia is 4 feet, 4 inches for males and 4 feet, 1 inch for females.

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Achondroplasia is not contagious since it results from gene abnormalities. If both parents have Achondroplasia there is a 25% chance of inheriting two defective genes, which would result in a fatal form of achondroplasia called homozygous achondroplasia.

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Careful neurologic examinations, with referral to a pediatric neurologist as necessary

MRI or CT of the foramen magnum region for evaluation of severe hypotonia or signs of spinal cord compression

Obtaining history for possible sleep apnea

Evaluation for low thoracic or high lumbar gibbus if truncal weakness is present

Referral to a pediatric orthopedist if bowing of the legs interferes with walking

Medications of growth hormones or surgery

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About 80 percent of people with achondroplasia have average-size parents. But mostly just randomly occurs.

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caused by mutations in the FGFR3 gene.

This gene provides instructions for making a protein that is involved in the development and maintenance of bone and brain tissue.

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Abnormality of the wide portion of a long bone.

Rib abnormalities.

Nasal tip, upturned.

Chronic infections of the middle ear.

Depressed bridge of nose

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a disorder of bone growth that prevents the changing of cartilage (particularly in the long bones of the arms and legs) to bone. It is also called dwarfism.