A fracture of a newborn’s collar bone (clavicle) can occur during a difficult vaginal delivery. It is fairly common during difficult births.
The baby will not move the painful, injured arm. Instead, the baby will hold it still against the side of the body. Lifting the baby under the arms causes the child pain. Sometimes the fracture can be felt with the fingers, but usually the problem cannot be seen or felt.
Within a few weeks, a hard lump may develop where the bone is healing. This lump may be the only sign that the newborn had a broken collar bone. (adapted from nlm)
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