Early development of baby milestones is marked by primitive reflexes - reflex actions that occur in response to certain stimuli. These primitive reflexes are important for babies to be able to cope alone after nine months being totally supported in the womb.

Primitive reflexes do not usually persist (except the parachute reflex) and persistence can be a sign that all is not well with the neurological system of the baby.

Causes of retain primitive reflexes:

¾    Low birth weight at birth

¾    Prolonged or premature birth

¾    Traumatic birth, suction, forceps, emergency C-section

¾    Severe illness, trauma or injury in infancy

¾    Lack of tummy time

¾    Decreased ability to explore environment in early months

¾    Too much time in bouncer, stroller, or car seat which restricts (if overused) developing motor patterns and pathways

¾    Missing crawling stage

(picture credits to artlog.liyeung.com)

This kinda useful for me while I'm in ward, clerking patient :)

Can read more at here.