Definition of Metatarsus adductus:

Metatarsus adductus is a foot deformity. The bones in the front half of the foot bend or turn in toward the body.

Causes, incidence, and risk factors:

Metatarsus adductus is thought to be caused by the infant's position inside the womb. Risks may include:

• The baby's bottom pointed down in the womb (breech position)
• The mother had a condition called oligohydramnios, in which she did not produce enough amniotic fluid

There may also be a family history of the condition.

Metatarsus adductus is a fairly common problem. It is one of the reasons why people develop "in-toeing."

Newborns with metatarsus adductus often have a problem called developmental dysplasia of the hip (DDH), in which the thigh bone slips out of the hip socket.