Normal growth curve interpretation and developmental milestone timing tested on USMLE Step 2 CK.
35 cards · basic cards · AI-written, checked twice. Edit anything.
- What growth pattern defines failure to thrive (FTT) on a growth chart?
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Weight below the 3rd to 5th percentile for age, or a downward crossing of two major percentile lines.- What is the maximum expected physiologic weight loss in a healthy newborn during the first week of life?
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Up to 7 to 10 percent of birth weight.- By what age should a healthy newborn regain its birth weight?
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By about 10 to 14 days of life.- By what age does a healthy infant's birth weight typically double?
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4 to 6 months.- By what age does a healthy infant's birth weight typically triple?
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12 months.- By what age does a healthy infant's birth weight typically quadruple?
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24 months.- By roughly what percentage does an infant's birth length increase during the first year of life?
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About 50 percent.- What is the average head circumference of a full-term newborn?
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About 35 cm (roughly 13.5 inches).- By what age does the posterior fontanelle normally close?
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By about 2 months of age.- By what age does the anterior fontanelle normally close?
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Between 9 and 18 months of age.- Until what age should a preterm infant's growth be plotted using corrected (adjusted) age rather than chronological age?
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Until about 24 months of age.- How is microcephaly defined in terms of head circumference?
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Head circumference more than 2 standard deviations below the mean for age and sex (roughly below the 3rd percentile).- How is macrocephaly defined in terms of head circumference?
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Head circumference more than 2 standard deviations above the mean for age and sex (roughly above the 97th percentile).- In constitutional growth delay, how does bone age compare to chronological age, and what is the eventual outcome?
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Bone age is delayed relative to chronological age, but the child eventually reaches a normal adult height.- In familial (genetic) short stature, how does bone age compare to chronological age?
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Bone age matches chronological age, and final adult height tracks close to the parents' heights.
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