A reflex is an automatic, instinctive response the body makes without thinking. It happens quickly and involuntarily in response to a certain stimulus, like pulling your hand away when you touch something hot. Full definition
This would appear an innate drive: The sucking reflex of the newborn is something close to a human universal. (firstthings.com)
Babies might gag and cough often when starting finger foods because the gag reflex in younger babies mouths is quite far forward and moves back as they age. (ohbabynutrition.com)
The only point to keep in mind is the «presence of mind» and «quick reflex actions». (feedspot.com)