It is relatively common for the Flexor digitorum superficialis to be missing from the little finger, bilaterally and unilaterally, which can cause problems when diagnosing a little finger injury.
The grasp reflex (newborn reflexes) It occurs when placing an object, such as a finger, onto the infant's palm (palmar grasp) or sole (plantar grasp). The infant responds by flexing fingers or curling the toes. The palmar grasp usually disappears by 3 to 4 months and the plantar grasp by 6 to 8 months.
The Babinski reflex is present in normal babies of full term birth. When the sole of the infant's foot is stroked on the outside from the heel to the toe, the infant's toes fan out and curl and the foot twists in. This reflex usually lasts for the first year after birth.