Which newborn reflex elicits the following reaction: Head turns to one side - the way the head is facing, the arm/leg is stretched out while the other is bent?

Tonic neck reflex.

Moro reflex.

Startled reflex.

Babinski reflex.

Answer and Explanation

The Correct Answer is A

Choice A reason:

The tonic neck reflex, also called the fencing posture, occurs when a baby's head is turned to one side. The arm and leg on that side stretch out, while the opposite arm and leg bend up at the elbow. This reflex lasts until the baby is about 5 to 7 months old. This reflex matches the description of the question.

Choice B reason:

The Moro reflex, also called the startle reflex, is the baby's reaction to being startled. The cause is often a loud sound, a sudden movement, or even their own cry. As an adult, you may jump or gasp when you are startled. A baby will throw back their head, extend their arms and legs, cry, then pull their arms and legs back in. This reflex does not match the description of the question.

Choice C reason:

The startled reflex is not a distinct reflex in newborns. It is another name for the Moro reflex, which is explained.

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Correct Answer is A

Explanation

The correct answer is: a. Hyperbilirubinemia.

Choice A: Hyperbilirubinemia

Reason: Hyperbilirubinemia in newborns is often caused by the increased breakdown of red blood cells, which have a shorter lifespan in neonates. This breakdown produces bilirubin, a yellow pigment that can accumulate in the blood, leading to jaundice. The liver of a newborn is not fully mature and may not be able to process and excrete bilirubin efficiently, resulting in hyperbilirubinemia.

Choice B: Respiratory Distress Syndrome

Reason: Respiratory Distress Syndrome (RDS) is primarily caused by a deficiency of surfactant in the lungs, which is more common in premature infants. It is not directly related to the lifespan of red blood cells. Symptoms include rapid, shallow breathing and a bluish color due to lack of oxygen.

Choice C: Polycythemia

Reason: Polycythemia is characterized by an abnormally high concentration of red blood cells. It is often due to factors like delayed cord clamping or maternal diabetes, rather than the decreased lifespan of red blood cells. Polycythemia can lead to increased blood viscosity and complications such as sluggish blood flow.

Choice D: Transient Tachypnea

Reason: Transient Tachypnea of the Newborn (TTN) is a respiratory condition caused by delayed clearance of fetal lung fluid. It typically resolves within a few days and is not related to the lifespan of red blood cells. Symptoms include rapid breathing and grunting.

A. 10% to 15% of their birth weight. B. 20% of their birth weight. C. 15% to 18% of their birth weight. D. 5% to 10% of their birth weight.

Correct Answer is D

Explanation

Choice A reason:

10% to 15% of their birth weight. This is incorrect because this range is too high for a normal newborn weight loss. Losing more than 10% of their birth weight may indicate dehydration, inadequate feeding, or other problems. • Choice B reason:

20% of their birth weight. This is incorrect because this percentage is way too high for a normal newborn weight loss. Losing 20% of their birth weight would be a serious sign of illness or malnutrition. • Choice C reason:

15% to 18% of their birth weight. This is incorrect because this range is also too high for a normal newborn weight loss. Losing 15% to 18% of their birth weight would be a cause for concern and require further evaluation. • Choice D reason:

5% to 10% of their birth weight. This is correct because this range is within the normal limits for a newborn weight loss. Newborns lose some weight as a result of insufficient caloric intake, fluid loss, and metabolic adjustments in the first week after birth. They usually regain their birth weight by the second week.

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Which newborn reflex elicits the following reaction: Head turns to one side - the way the head is facing, the arm/leg is stretched out while the other is bent?

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