Leg-Straightening Reflex

What is the “Leg-Straightening Reflex” used for?

• This reflex is present at birth and normally disappears at approximately 4 months of age so that further motor development can occur.

How to perform the “Leg-Straightening Reflex”?

• The infant is held upright in a standing position, with the examiner providing support under the axillae and around the chest. 
• The soles of the infant’s feet are pressed to the table or ground several times.

What is the positive result?

• When the support response is positive, the lower limbs and trunk will go into extension; the legs act as strong supporting pillars for weight bearing. 
• If the reflex persists, reciprocal leg movements cannot appear and the infant will be unable to stand or walk.