What is the response called when an infant's legs move in response to pressure on them when in an upright position?

The response where an infant's legs move when pressure is applied to the soles while they are in an upright position is known as the stepping reflex. This reflex is observed in infants typically around the time they are a few weeks old to several months old. When their feet touch a flat surface, they exhibit a stepping motion as if they are trying to walk. This reflex illustrates the natural responses that infants have, aiding their development and preparing them for future motor skills.

The stepping reflex is particularly significant because it helps to lay the groundwork for voluntary walking later in life. Observing this reflex can be a valuable indicator of an infant’s neurological and physical development, showing that the brain and muscles are functioning together properly.

The other responses refer to different reflexes with unique characteristics: the Moro reflex involves a general startle response to stimuli, the Babinski reflex is noted by the curling of the toes when the foot is stroked, and the palmar grasp reflex is when an infant automatically grasps an object placed in their hand. Each reflex has a specific function and indicates different aspects of an infant's development.