Medlife Crisis Human Baby Biology: Primitive Reflexes Explained Posted: January 14, 2025 | Last updated: January 14, 2025 Newborn babies may seem helpless, but they’re born with an incredible ...

The STNR is a primitive reflex that is characterized by upper extremity (UE) extension and lower extremity (LE) flexion with neck extension, and by UE flexion and LE extension with neck flexion.