Growth & Development in Pediatrics Flashcards

A 9-month-old infant's weight is at the 5th percentile, length at the 50th percentile, and head circumference at the 50th percentile. Which pattern is most consistent with this presentation?

Answer: Undernutrition with adequate linear growth

Weight lagging behind length and head circumference is the classic pattern of undernutrition (non-organic failure to thrive), as weight is the first parameter to falter when caloric intake is inadequate.

Which of the following best describes the Fenton growth chart and its primary use?

Answer: A preterm-specific chart plotting growth from 22 weeks gestational age to 50 weeks PMA

The Fenton 2013 growth chart is designed for preterm infants, covering 22 weeks gestational age through 50 weeks postmenstrual age, bridging neonatal and early postnatal growth assessment.

At what age does the posterior fontanelle typically close in a healthy term infant?

Answer: By 2 months of age

The posterior fontanelle closes by 6–8 weeks of age in most term infants, much earlier than the anterior fontanelle.

A 3-year-old child's mid-parental height target is calculated at the 60th percentile. The child is currently at the 15th percentile for height. Which evaluation is most warranted?

Answer: Bone age radiograph and growth hormone evaluation

A significant discrepancy between a child's current height percentile and the mid-parental target warrants investigation including bone age and endocrine evaluation to rule out growth hormone deficiency or other pathology.

Which nutrient deficiency is most specifically associated with impaired linear growth even in the absence of overt malnutrition?

Answer: Zinc

Zinc deficiency specifically impairs linear growth and is associated with growth faltering even when overall caloric intake appears adequate, due to zinc's role in IGF-1 signaling and cell proliferation.

During the adolescent growth spurt, girls typically achieve peak height velocity (PHV) at approximately what Tanner stage?

Answer: Tanner stage 3–4

Girls typically reach peak height velocity around Tanner stage 2–3 (early-to-mid puberty), earlier in pubertal development than boys who reach PHV at Tanner stage 3–4.

A 6-month-old term infant was born at the 10th percentile for weight and is now at the 50th percentile. The parents are concerned about overfeeding. How should this trajectory be interpreted?

Answer: This likely represents appropriate catch-up growth toward genetic potential

Infants who were growth-restricted in utero or born small often demonstrate catch-up growth in the first 6–12 months as they track toward their genetic potential, which is a normal and expected pattern.