Your baby's flinch when his sister screams feels alarming, and you want a clear answer about whether it harms him. A startled reaction is usually a normal reflex, not a sign of lasting damage, but ...

Doctors test for them within minutes of birth, because these simple motions reveal complex brain development. Primitive reflexes show how deeply survival is written into our biology ...

Reflexes are automatic and involuntary actions the body produces in response to certain stimuli. While some reflexes can involve muscles and movement, others involve internal processes within the body ...