Question

Why do newborns grip your finger so tightly?

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Answer

That is the palmar grasp reflex, one of several primitive reflexes newborns are born with — automatic, involuntary responses that emerge and then disappear on a fairly predictable schedule.

The palmar grasp. Stroke a newborn's palm and the fingers close firmly. The grip can be surprisingly strong. It appears from birth and typically fades around five to six months, as voluntary grasping takes over.

Why it exists is debated. The most common explanation is evolutionary: primate infants cling to their mother's fur while she moves, and the reflex is a vestige of that. Human infants have a corresponding reflex in the feet — the plantar grasp — which supports the idea, since gripping with toes has no current use.

The other primitive reflexes are worth recognising:

Moro (startle) reflex. In response to a sudden noise or the sensation of falling, the baby flings the arms out, then brings them back in and often cries. It fades by around four to six months, and is a frequent cause of self-waking — which is part of why swaddling helps some babies sleep.

Rooting reflex. Stroke a newborn's cheek and they turn toward it with an open mouth, searching for the nipple. Fades around four months.

Sucking reflex, present before birth.

Stepping reflex. Held upright with feet touching a surface, a newborn makes walking movements. It disappears around two months and is unrelated to learning to walk later.

Tonic neck (fencing) reflex. Head turned to one side, the arm on that side extends and the other bends.

Why clinicians check them. Their presence, symmetry and timely disappearance are useful neurological indicators. A reflex absent when expected, present on only one side, or persisting well beyond its usual window can signal a developmental concern and is checked at routine reviews.

Mention anything asymmetric to a health visitor or GP.

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