Sometimes an infant will seem startled and will fling their arms out and possibly cry. this is known as the reflex.

a - moro
b - rooting
c - sucking
d - grasping

the correct answer is moro reflex. this is usually witnessed in infants normally up to the age of 4-5 months (in some cases maybe more)  

it is caused by a sudden loss of support that makes the baby feel as if he or she is falling or is going to fall and hence the flinging of the arms and crying.

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