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 ...

The tonic neck reflex (TNR) is also called the asymmetric(al) tonic neck reflex (ATNR). There’s also a symmetric(al) tonic neck reflex (STNR), which comes later in infancy and is less talked about.

As the STNR appears, your baby’s ATNR (asymmetric tonic neck reflex) goes away. You’ll see ATNR when your little one is lying on their back, with their: face turned to one side arm and leg ...