Human babies are born with in-built instincts. These are called primitive reflexes. Don't forget to turn subtitles on.

To date I have collected extensive baseline information on the maturational patterns of some 15 motor activities and simple reflexes. Some of these ... Over the same time span, locomotion matures from ...

The STNR is a primitive reflex that is characterized by upper ... who were examined at and/or prior to term and who had normal motor milestones on followup at a mean age of 27 months (12-61).