A nurse is assessing a 2-day-old newborn's primitive reflexes. Which finding would indicate a normal Moro reflex response?

The Moro reflex is elicited by startling the newborn; normal response involves extension/abduction of arms and legs followed by adduction to midline. Other options describe rooting (1), Babinski (2), and grasp (3) reflexes.

Core Nursing Explanation Key Concept Analysis: This question assesses your knowledge of normal newborn primitive reflexes, specifically the Moro reflex. Primitive reflexes are involuntary, stereotyped movements present at birth that indicate neurological integrity. The Moro reflex is a startle response that tests the function of the brainstem and vestibular system. It is a key part of the newborn neurological assessment.

Answer Rationale: Key Point! The correct, normal response for the Moro reflex is a symmetrical, two-phase movement. First, the newborn extends and abducts the arms and legs, often with fingers spread (the "embrace" phase). Second, the newborn adducts the arms back toward the body, often with a cry (the "embrace" phase). Option ④ accurately describes this classic response. An absent, asymmetrical, or incomplete Moro reflex can indicate neurological issues, such as birth trauma, cerebral injury, or spinal cord lesion.

Distractor Analysis:
Watch out for confusion! Option ① describes the Rooting reflex. Stroking the cheek or corner of the mouth causes the newborn to turn the head toward the stimulus, aiding in breastfeeding.
Option ② describes the Babinski reflex (plantar reflex). Stroking the lateral sole of the foot from heel to toe causes the great toe to dorsiflex and the other toes to fan out. This is normal in infants but becomes abnormal (a sign of upper motor neuron lesion) if it persists beyond 2 years of age.
Option ③ describes the Palmar grasp reflex. Placing a finger or object in the newborn's palm elicits a strong, involuntary grasp. This reflex typically disappears around 2-3 months of age.

Related Concepts: Understanding primitive reflexes is crucial for pediatric nursing. Their presence at birth and subsequent disappearance at expected ages are milestones of neurological maturation. Other important reflexes include the Tonic neck reflex ("fencing posture"), Stepping reflex, and Sucking reflex. Persistence of primitive reflexes beyond the normal age or absence at birth requires further neurological evaluation. Concept Summary

Reflex	Stimulation Method	Normal Response	Age of Disappearance
Moro (Startle)	Sudden head extension, loud noise, or sensation of falling	Symmetrical extension/abduction of arms & legs, then adduction (embracing motion)	3-6 months
Rooting	Stroking cheek or corner of mouth	Turns head toward stimulus, opens mouth	3-4 months (when awake), 7 months (when asleep)
Babinski (Plantar)	Stroking lateral sole of foot (heel to toe)	Great toe dorsiflexes, other toes fan out	12-24 months (becomes adult response: toes curl downward)
Palmar Grasp	Placing object/finger in palm	Fingers flex in a strong grasp	2-3 months

Side-by-Side Comparison!

Assessment Goal	Normal Finding (Newborn)	Abnormal Finding & Possible Implication
Assessing Brainstem Integrity	Strong, symmetrical Moro reflex	Absent/Asymmetrical Moro: Brachial plexus injury (Erb's palsy), clavicle fracture, intracranial hemorrhage
Assessing Feeding Readiness	Strong Rooting and Sucking reflexes	Weak/absent reflexes: Prematurity, neurological depression, sepsis
Assessing Spinal Cord & Lower Neuron Function	Positive Babinski (toes fan)	Persistent Babinski after age 2: Upper motor neuron lesion (e.g., cerebral palsy)

Anatomy, Physiology & Pharmacology Points The Moro reflex is mediated by the brainstem and involves the vestibular system. The sudden sensation of falling or head movement triggers a cascade through the vestibular nuclei, leading to the motor response. Medications that depress the central nervous system (CNS), such as maternal opioids or sedatives administered during labor, can transiently diminish or abolish the Moro reflex. Memory Tips Mnemonic for Moro Response: "EMbrace and ADopt." First, they Extend and Move out (abduct), then they ADduct back in.
Quick Recall: Moro = Startle. Think of being startled and throwing your arms out.
Differentiation: Rooting is for finding food (cheek stroke). Grasp is for holding on (palm touch). Babinski is a foot test. High-Frequency NCLEX Topics Newborn assessment, including primitive reflexes, is a Core topic. The NCLEX-RN often tests your ability to: 1. Identify the normal response for a specific reflex. 2. Recognize which reflex is being described in a scenario. 3. Understand the clinical significance of an absent or asymmetric reflex (e.g., linking an asymmetric Moro to a brachial plexus injury). 4. Know the typical age ranges for the disappearance of these reflexes. Watch Out for Question Variations! * Instead of asking for the normal response, the question might present a finding and ask, "Which reflex is the nurse assessing?" (e.g., "The nurse strokes the newborn's sole and observes the toes fanning.") * The question could describe an abnormal finding (e.g., "The newborn's right arm remains extended and does not adduct during the Moro reflex") and ask for the priority nursing action (document and notify the provider) or the most likely cause (right brachial plexus injury). * It might integrate with maternal medication history: "A newborn whose mother received magnesium sulfate for preeclampsia is lethargic and has a weak Moro reflex. The nurse understands this is due to..." (Answer: CNS depressant effects of magnesium).

Nursing Clinical Practice Guide Clinical Scenario: You are the nurse performing a routine assessment on Baby Girl Rodriguez, a 38-hour-old newborn. The mother mentions the baby seems "jumpy." You plan to assess the primitive reflexes as part of the comprehensive newborn exam.

Nursing Intervention Strategy: 1. Assessment: Ensure the newborn is in a quiet, alert state, lying supine on a firm surface. Explain the procedure to the parents. To elicit the Moro reflex, you can either: a) Gently lift the baby's head and shoulders a few inches off the bed and then let it drop back momentarily (supporting the head), or b) Produce a sudden, loud noise nearby. Observe both arms and legs simultaneously. 2. Expected Finding (Normal): Symmetrical extension and abduction of all limbs, spreading of fingers, followed by flexion and adduction of arms across the chest. The baby may cry. 3. Abnormal Findings & Actions: * Asymmetry (one arm does not move or moves weakly): Document precisely ("Left Moro reflex absent, right present"). This is a red flag for possible brachial plexus injury (Erb's Palsy). Notify the pediatrician/provider immediately. * Absent Reflex Bilaterally: Consider CNS depression from medications, sepsis, or severe neurological injury. Assess other vital signs and reflexes, and notify the provider urgently. 4. Patient/Family Education: Explain to parents that the Moro reflex is normal and shows the baby's nervous system is working. Reassure them that the "startle" movements and occasional crying are expected. Teach them that this reflex will gradually disappear over the next few months.

Patient Safety and Precautions: * Never shake or jar the baby violently to elicit the reflex. Use controlled, safe methods. * Always support the head and neck when performing the "head drop" method. * Perform the assessment in a warm environment to prevent heat loss. * If the baby is crying or asleep, attempt to soothe or wait until a quiet alert state for an accurate assessment. Nursing Procedure & Medication Flow Procedure: Eliciting the Moro Reflex 1. Position infant supine on a firm, flat surface. 2. Ensure the infant's head is in midline position. 3. Method 1 (Head Drop): Support the infant's head and shoulders with your hands. Gently lift until the shoulders are slightly off the bed. Quickly but gently allow the head to drop back about 1-2 inches (into your supporting hand). 4. Method 2 (Startle): If hesitant to use head drop, create a sudden loud noise (e.g., clapping hands) near but not directly over the infant. 5. Observe the immediate, bilateral response of the arms, hands, and legs. 6. Document the response: "Moro reflex present and symmetrical bilaterally" or note any deviations. A Word from Your Senior Nurse "Newborn assessment is where your detective skills shine! That little Moro reflex is a window into the baby's brainstem function. In clinical practice, I've caught a brachial plexus injury just by noting one limp arm during the Moro reflex that everyone else thought was just 'the baby being sleepy.' Don't rush through these assessments. Take your time, do them correctly, and trust your observations. When you're studying, don't just memorize 'arms out then in.' Picture yourself in the nursery, feeling the weight of that tiny head in your hand, watching for that symmetrical embrace. That connection from page to practice is what makes a great nurse."