Answer:
The answer is Babinsky's Reflex.
Explanation:
Molly, stroking the bottom of her baby's foot, realizes how her toes open and then curl. This reflex is known as Babinsky's Reflex: When the sole of the foot is caressed firmly, the big toe bends toward the top of the foot and the other toes fan out. This reflex is normal until about two years of age.
