The following information may help to address your question:
Klumpke paralysis is caused by an injury to the nerves of the brachial plexus which may result from a difficult delivery. This injury can cause a stretching (neuropraxia,), tearing (called “avulsion” when the tear is at the spine, and “rupture” when it is not), or scarring (neuroma) of the brachial plexus nerves. Most infants with Klumpke paralysis have the more mild form of injury (neuropraxia) and often recover within 6 months.
Most infants recover from neuropraxia within 4 months. Parents or guardians of infants that show no evidence of spontaneous recovery at 4 months, may be counseled regarding additional treatment options. These treatment options may include: