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Difficulty: MediumNormal Growth and Development

A female infant, chronologically 6 months of age, is evaluated during a routine health maintenance visit. She was delivered prematurely at 28 weeks gestation following a maternal placental abruption. The parents express significant concern regarding her development. They report that their older child, who was born at term, was able to sit without support and pass toys from one hand to the other by this age, whereas this patient is unable to perform these actions. During the physical examination, the infant visually tracks a brightly colored toy past the midline, coos in response to the physician's voice, and demonstrates a social smile. When placed in the prone position, she lifts her head and chest while resting on her forearms. When pulled to a sitting position, a very slight head lag is noted. Muscle tone and deep tendon reflexes are within normal limits. Which of the following is the most appropriate next step in the management of this patient?

  1. Reassurance and continued routine surveillanceAnswer
  2. B
    Referral for pediatric physical therapy
  3. C
    Comprehensive audiology evaluation
  4. D
    Magnetic resonance imaging of the brain
  5. E
    Genetic testing for spinal muscular atrophy

Answer

Reassurance and continued routine surveillance
The most appropriate management is reassurance and continued routine surveillance because this infant's developmental milestones are completely normal for her corrected age. For infants born prematurely, developmental milestones must be evaluated based on their corrected age until they reach 2 years of chronological age. This infant was born at 28 weeks gestation, which is 12 weeks (approximately 3 months) premature based on a standard 40-week term. Therefore, at a chronological age of 6 months, her corrected age is 3 months. Her parents are mistakenly expecting 6-month milestones (sitting without support, transferring objects). However, her physical examination demonstrates normal 3-month milestones, including lifting her head and chest in the prone position, resolving head lag, tracking past the midline, cooing, and demonstrating a social smile.

Step-by-Step Solution

1
Calculate the infant's degree of prematurity based on a standard 40-week gestation.
The infant was born at 2828 weeks gestation, which means she was 40−28=1240 - 28 = 12 weeks premature (approximately 33 months).
Premature infants must have their developmental milestones assessed based on their corrected age, rather than their chronological age, until they reach 24 months.
2
Calculate the infant's corrected age by subtracting the degree of prematurity from her chronological age.
Chronological age (66 months) minus prematurity (33 months) equals a corrected age of 33 months.
This establishes the developmental baseline we should expect for this specific patient.
3
Compare the infant's current physical abilities to the expected milestones for a 3-month-old infant.
The infant can lift her head and chest in prone, track past the midline, coo, and smile socially. These abilities perfectly match the expectations for a 3-month-old.
Normal 3-month milestones include social smiling, cooing, holding the head steady (with only slight resolving head lag), and tracking past the midline.
4
Evaluate the parents' specific concerns regarding sitting and transferring objects.
Sitting without support and transferring objects hand-to-hand are 6-month milestones. Because her corrected age is only 3 months, her inability to perform these actions is completely developmentally appropriate.
Recognizing that the infant is developing normally for her corrected age indicates that reassurance is the appropriate management step.

Key Concept

Assessing developmental milestones in premature infants requires using a corrected age (chronological age minus weeks of prematurity) until they reach 24 months of age.
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Topics

Normal Growth and Development

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