Automatic physical movements of a new born in response to a particular event or stimulus is termed as: 

 Key PointsReflexes are involuntary, automatic movements that newborns exhibit in response to specific stimuli. These are crucial for survival and neurological development.

Some common newborn reflexes include:

• Moro Reflex (startle reflex) – When startled, the baby extends arms and legs, then brings them back in.
• Rooting Reflex – When the baby’s cheek is touched, they turn their head toward the touch and open their mouth for feeding.
• Grasp Reflex – When an object is placed in the baby's palm, they instinctively grasp it.
• Babinski Reflex – When the sole of the foot is stroked, the baby’s toes spread out.

Thus, Automatic physical movements of a new born in response to a particular event or stimulus is termed as reflexes.

Hint

• Retention refers to holding onto or remembering information, unrelated to physical movements.
• Retardation is an outdated and inappropriate term once used for intellectual disabilities.
• Recovery refers to regaining health or function after an illness or injury.