Before revision: The symmetrical tonic neck reflex (STNR) is a primitive reflex that normally emerges during the first year of an infant's life and is diminished by the age of 9-10 months.
After revision: The symmetrical tonic neck reflex (STNR) is a primitive reflex that normally emerges during the first year of an infant's life and is diminished by the age of 9–10 months.