Which of the following reflexes is not present at birth –
## **Core Concept**
The question tests knowledge of neonatal reflexes and their developmental timelines. Neonatal reflexes are automatic responses to specific stimuli that are present at birth and may disappear as the nervous system matures. Understanding which reflexes are present at birth and which develop later is crucial for assessing neurological development in infants.
## **Why the Correct Answer is Right**
The Moro reflex, also known as the startle reflex, is one of the primitive reflexes present at birth. The rooting reflex and sucking reflex are also present at birth, aiding in feeding. The parachute reflex, however, is a postural reflex that develops later in infancy. It is a protective reflex that helps in maintaining posture and balance when the infant is prone or in a sitting position and is pushed forward. This reflex typically develops around 6-9 months of age, making it not present at birth.
## **Why Each Wrong Option is Incorrect**
- **Option A:** The Moro reflex is indeed present at birth, helping infants to cling to their caregivers, possibly as a protective mechanism.
- **Option B:** The rooting reflex is also present at birth, facilitating feeding by causing the infant to turn towards a nipple or similar object that touches their cheek.
- **Option C:** The sucking reflex is present and crucial for feeding; it helps infants to suckle and obtain nourishment.
## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that the absence of certain reflexes at birth or their persistence beyond the age by which they should have disappeared can indicate neurological issues. For example, the persistence of primitive reflexes beyond infancy can suggest cerebral palsy or other neurological disorders.
## **Correct Answer:** . parachute reflex