Newborns exhibit crooked mouths when crying or smiling, with one side unable to lift while the other remains normal. Chromosome karyotyping and brain MRI scans have shown no abnormalities. At two months old, the only issue is with the mouth, while eye closure is normal. Traditional Chinese medicine suggests acupuncture treatment, twice daily, along with 0.5 mg of methenamine tablets, taken three times a day, to observe the effects. Western medicine recommends initial massage and warm therapy to observe the efficacy. The child’s development is normal except for the mouth problem when partially open. Excessive force on one side prevents the mouth from closing properly. What could be the cause? What treatment options are available?