In fact, this is the tonic neck reflex. Here’s what you need to know. The tonic neck reflex begins about 18 weeks after conception. That’s right — the associated movements start in the womb.

Asymmetric tonic neck reflex, or ATNR, is one of the primitive reflexes that babies experience as part of brain development. These reflexes are crucial because they help your baby to survive and ...

There are five common reflexes you’ll see in your newborn: The symmetric tonic neck reflex (STNR) is a reflex that normally appears during your baby’s first year. It typically begins to ...

The symmetric tonic neck reflex (STNR), sometimes also called the symmetrical tonic neck reflex, is another very important reflex. You’ll start to see it when your baby is 6 to 9 months old.