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Difficulty: HardPreventive Care and Immunizations

An anxious mother brings her 12-month-old infant to the clinic for a routine well-child examination. The infant was born prematurely at 28 weeks gestation following a complicated pregnancy but was eventually discharged from the neonatal intensive care unit without major long-term complications. He currently weighs 9.2 kg (20.3 lb). When evaluating the infant's developmental progress, the physician observes him pulling to a stand, cruising along the examination table, and successfully using a pincer grasp to pick up small pieces of cereal. He babbles "mama" and "dada" without directing the words at a specific parent and enthusiastically plays a game of peek-a-boo. The mother expresses concern that her friend's 12-month-old child is already walking independently and speaking specific words. Because she believes her son is physically vulnerable and delayed, she requests that any vaccines, particularly "strong live vaccines," be delayed until he "catches up." Which of the following is the most appropriate next step in the management of this patient?

  1. Reassure the mother regarding the infant's development and administer all routine 12-month immunizations.Answer
  2. B
    Reassure the mother regarding the infant's development but postpone live-attenuated vaccines until the infant reaches a corrected age of 12 months.
  3. C
    Refer the infant for a comprehensive developmental evaluation and administer all routine 12-month immunizations.
  4. D
    Refer the infant for a comprehensive developmental evaluation and postpone live-attenuated vaccines until the infant reaches a corrected age of 12 months.
  5. E
    Reassure the mother regarding the infant's development but postpone all vaccines until the infant reaches a corrected age of 12 months.

Answer

Reassure the mother regarding the infant's development and administer all routine 12-month immunizations.
The correct management is to reassure the mother and administer all age-appropriate vaccines for a 12-month-old. Preterm infants should be evaluated for developmental milestones based on their corrected age until they are 2 years old. This infant's chronological age is 12 months, but he was born 3 months early (28 weeks gestation). Thus, his corrected age is 9 months. The milestones he demonstrates (pulling to stand, cruising, pincer grasp, non-specific babbling, and playing peek-a-boo) are exactly appropriate for a 9-month-old infant. Therefore, no developmental referral is needed, and the mother can be reassured. Regarding immunizations, preterm infants should receive all standard vaccines, including live-attenuated vaccines like MMR and Varicella, according to their chronological age. There is no need to delay vaccination for "catch up" growth.

Step-by-Step Solution

1
Calculate the infant's corrected age for developmental assessment.
The infant was born at 28 weeks gestation, which is 12 weeks (approximately 3 months) premature. Subtracting 3 months from the chronological age of 12 months yields a corrected age of 9 months.
Premature infants must have their developmental milestones assessed according to their corrected age until they reach 24 months of chronological age.
2
Evaluate the infant's observed milestones against expected milestones.
Pulling to stand, cruising, using a pincer grasp, babbling non-specifically, and playing peek-a-boo are completely normal and expected milestones for a 9-month-old infant.
Because the milestones match the infant's corrected age, development is on track, and early intervention referral is unnecessary. The physician should reassure the mother.
3
Determine the appropriate immunization schedule considering the infant's prematurity.
The infant should receive all routine 12-month vaccines, including live-attenuated vaccines such as the Measles, Mumps, and Rubella (MMR) and Varicella vaccines.
Unlike developmental milestones, vaccine schedules for premature infants are strictly based on chronological age. Delaying vaccines leaves the infant vulnerable to preventable infectious diseases.

Key Concept

Developmental milestones in preterm infants should be assessed using corrected age until 24 months, whereas routine immunizations (including live vaccines) must be administered based on chronological age.
Estimated Time:1m 30s
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Topics

Preventive Care and Immunizations

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