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Difficulty: MediumNeonatal Disorders

A pediatric resident is called to evaluate a full-term male newborn who is 2 days old. The nursing staff requested the assessment prior to the infant's planned discharge home. The infant was born at 39 weeks gestation via uncomplicated vaginal delivery to a 24-year-old primigravid mother with a negative group B *Streptococcus* swab. The mother states that her baby is breastfeeding vigorously but had one small episode of non-bilious regurgitation this morning. She also points out a new rash that erupted on his chest and upper arms overnight. The infant's temperature is 36.9°C (98.4°F), pulse is 135/min, and respirations are 42/min. On examination, the infant is active and well-appearing. The abdomen is soft and non-distended. The skin shows numerous 2- to 3-mm erythematous macules, several of which have 1-mm central yellow-white pustules, distributed over the trunk and proximal extremities. The palms and soles are completely clear.

Which of the following is the most appropriate next step in management?

  1. Reassurance and routine newborn careAnswer
  2. B
    Administer intravenous acyclovir
  3. C
    Obtain blood cultures and initiate ampicillin and gentamicin
  4. D
    Obtain an abdominal radiograph
  5. E
    Administer the live-attenuated rotavirus vaccine

Answer

Reassurance and routine newborn care
The correct approach is reassurance and routine newborn care. This patient is presenting with classic signs of erythema toxicum neonatorum (ETN), an exceedingly common and benign rash seen in up to 50% of healthy full-term neonates. ETN typically appears within the first 24 to 72 hours of life. It is characterized by scattered erythematous macules with central papules or pustules, primarily distributed on the trunk and proximal extremities, while notably sparing the palms and soles. Because the infant is afebrile, vigorous, and the physical examination is otherwise entirely normal, no diagnostic testing, antibiotics, or antiviral therapies are required. Furthermore, the single episode of non-bilious emesis in an otherwise well-feeding infant is consistent with normal physiologic gastroesophageal reflux (spitting up). This does not require further investigation in the absence of red-flag symptoms such as bilious color, poor weight gain, or abdominal distension.

Step-by-Step Solution

1
Analyze the rash characteristics and vital signs.
The infant is afebrile and well-appearing. The rash consists of scattered erythematous macules with central pustules that spare the palms and soles, which is the classic presentation of erythema toxicum neonatorum (ETN).
Differentiating benign neonatal rashes from infectious etiologies is crucial to avoid unnecessary and potentially harmful interventions.
2
Evaluate the gastrointestinal symptom.
A single episode of non-bilious regurgitation in a well-feeding newborn with a soft, non-distended abdomen is consistent with normal physiologic gastroesophageal reflux.
Pathologic causes of emesis (such as small bowel obstruction) typically present with bilious emesis, abdominal distension, or failure to pass meconium.
3
Determine the appropriate management plan.
Since both the rash and the regurgitation are benign, physiologic findings that will self-resolve, no diagnostic testing or pharmacotherapy is indicated.
Standard newborn care and parental reassurance represent the highest standard of care for expected physiologic transitions.

Key Concept

Erythema toxicum neonatorum is a common, benign, self-limited rash in the first week of life presenting with scattered erythematous macules and central pustules; it requires no intervention other than parental reassurance.
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Topics

Neonatal Disorders

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