The lower lip fails to pull down on the affected side giving the mouth an unbalanced appearance. Generally the nerve has been damaged by pressure rather than the nerve fibers torn, in which case a return to normal occurs over the next few weeks to months. Good obstetrical technique and the proper use of forceps have reduced the incidence of facial nerve palsy. There is no prevention for pressure injuries that occur to the unborn child. In most cases, observation to see if the paralysis will disappear is the only treatment.
Permanent paralysis requires special therapy.
Full spontaneous recovery is the typical outcome. Permanent paralysis of facial muscles on the affected side occasionally occurs. This condition is generally diagnosed while the infant is in the hospital. Mild cases involving just the lower lip may escape observation and later be noticed by a parent, grandparent, or other visitor. If your infant crying infant's mouth looks unbalanced, you may want to call your health care provider.