Rooting reflex disappears in:
**Core Concept**
The rooting reflex is a primitive reflex that helps newborns locate and attach to their mother's nipple for feeding. This reflex is characterized by the infant's head turning towards a stimulus applied to the cheek, indicating the presence of milk.
**Why the Correct Answer is Right**
The rooting reflex disappears as the infant develops and matures, typically around 4-6 months of age. This is due to the gradual maturation of the central nervous system, particularly the development of higher-level motor control and the integration of sensory information. As the infant's brain matures, the primitive reflexes like the rooting reflex are suppressed by the development of more complex and coordinated motor responses.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the rooting reflex does not disappear in premature infants, which are born before the typical maturation time of this reflex.
* **Option B:** This option is incorrect because the rooting reflex is not suppressed by the development of the sucking reflex, which is a separate motor response that helps infants feed.
* **Option C:** This option is incorrect because the rooting reflex is not directly related to the development of the infant's vision, which is a separate sensory system.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the disappearance of primitive reflexes like the rooting reflex is a normal part of infant development, and their presence or absence can be an important indicator of neurological maturity.
**Correct Answer:** D