Jaw is smaller proportionate to the face. Can happen if the mother drinks too much alcohol during pregnancy or with certain genetic conditions like Trisomy 13 and Progeria.
Other conditions causing this include Pierre Robin Syndrome, Cri-du-chat syndrome, Achondrogenesis, and Treacher Collins syndrome.
It can be severe causing feeding and breathing problems. If any trouble with chewing, talking, then discuss with Oral surgeon.
It may grow long enough on its own. Meanwhile, Modified eating methods may be needed. Otherwise, Corrective surgery by oral or maxillofacial surgeon is required.
Orthodontic braces can help.
Genetic counseling if you are worried about passing to your child.
