Growth & Development in Pediatrics Flashcards

A 15-year-old male patient with Crohn's disease presents with growth failure. Compared to a healthy peer, his linear growth deficit is most likely driven by which primary mechanism?

Answer: Chronic inflammation suppressing IGF-1 and increasing catabolic cytokines

In inflammatory bowel disease, pro-inflammatory cytokines (particularly IL-6 and TNF-α) suppress hepatic IGF-1 production and promote catabolism, directly impairing linear growth independent of nutritional deficits.

Which formula best calculates mid-parental height (MPH) target for a girl?

Answer: (Father's height − 13 cm + Mother's height) / 2

For girls, MPH = (Father's height − 13 cm + Mother's height) / 2, with a ±10 cm target range; for boys, 13 cm is added to mother's height instead of subtracted from father's.

A 4-year-old child has a BMI of 18.5 kg/m². How should this be categorized using the CDC growth charts?

Answer: Obese (≥95th percentile)

For children aged 2–19 years, obesity is defined as BMI ≥ 95th percentile for age and sex; a BMI of 18.5 at age 4 is well above the 95th percentile and falls in the obese category.

Which clinical finding would most strongly suggest craniosynostosis rather than positional plagiocephaly in a 4-month-old infant with an asymmetric head shape?

Answer: A palpable bony ridge along a cranial suture

A palpable bony ridge along a suture line indicates premature fusion (craniosynostosis), whereas positional plagiocephaly shows no suture ridging and typically presents with the characteristic parallelogram head shape.

Energy requirements per kilogram of body weight are highest during which period of childhood?

Answer: Infancy (0–6 months)

Infants have the highest energy requirements per kilogram (~100–120 kcal/kg/day) relative to body weight due to the extremely rapid rate of growth and high metabolic rate during the first 6 months of life.

A 2-year-old child's growth chart shows weight and length both crossing downward from the 50th to the 10th percentile over 12 months. The head circumference remains at the 50th percentile. Which cause is most consistent with this symmetric growth pattern?

Answer: Constitutional growth delay

Proportional downward crossing of both weight and length with preserved head circumference in a toddler, without red flags, is a common presentation of constitutional growth delay, where growth is slow but follows a consistent, normal pattern.

In a preterm infant receiving parenteral nutrition, which serum marker is most useful for monitoring adequacy of protein intake and anabolic state?

Answer: Prealbumin (transthyretin)

Prealbumin has a short half-life of 2–3 days, making it a more sensitive marker of acute changes in protein synthesis and nutritional status than albumin (half-life ~20 days) in the neonatal ICU setting.