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.
don't panic, he'll be checking for the Moro Reflex! Moro Reflex birth - 6 months If the baby has a sense of falling or not being supported, the arms stretch out to the sides, and the legs stretch out full length. The arms and legs then return to a normal position beside the body.