Bobby touches his newborn brother's palm, and his little brother takes hold of Bobby's finger and will not let go. This is known as the rooting reflex.
In a few cases, reflexes alternate into voluntary behavior. For example, your toddler is born with a rooting reflex that activates him to show his head in the direction of your hand in case you stroke his cheek or mouth. This enables him to locate the nipple at feeding time.
The rooting reflex in infants is a fundamental survival instinct. This reflex enables your toddler locate and latch onto a bottle or your breast to start feeding. When you lightly stroke the nook of your toddler's mouth together along with your nipple, they must instinctively flip their head in the direction of it to nurse.
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