The birth height of a newborn doubles at?

Appeared in: NORCET 2 - 2021 (shift-1)

Explanation

The average length of a newborn at birth is approximately 50 cm.
By the age of 4 years, a child's height typically reaches around 100 cm, which is double their birth length.
This is a standard milestone used in pediatric growth assessments.

Option A: At 2 years, a child's height is approximately 87 cm. While this is a significant increase, it is not double the average birth length of 50 cm.
Option C: By 5 years, a child's height is typically around 105-110 cm, which is more than double their birth length.
Option D: At 1 year, an infant's length increases by about 50% to approximately 75 cm, not 100% (doubled).

Visual 1: Growth Chart - A WHO or IAP growth chart for boys/girls showing length/height-for-age from birth to 5 years. This would visually demonstrate the growth curve, clearly showing that the 100 cm mark (double the 50 cm birth length) is crossed at approximately 4 years of age.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Normal growth and development milestones in children, specifically focusing on height as background academic context rather than a clinical decision trigger.
Nurses use these growth milestones during well-baby visits and in under-5 clinics to quickly screen for potential health, nutritional, or developmental problems.
A significant deviation from this pattern (e.g., failure to grow in length) would prompt the nurse to perform a more detailed assessment, review feeding history, and potentially refer the child for further evaluation.
What if? If a child's length has not doubled by age 5, this would be considered a significant growth delay (stunting) and would require investigation into underlying causes like chronic illness, malnutrition, or endocrine disorders.

How to Approach the Question

This is a factual recall question about pediatric growth milestones.
First, recall the average birth length of a full-term infant, which is about 50 cm.
Next, recall the key milestones for length/height increase. The most common ones are the increase at 1 year and when it doubles.
Remember that weight milestones (doubling at 5 months, tripling at 1 year) are different from height milestones.
Calculate what double the birth length would be (50 cm x 2 = 100 cm).
Evaluate the options based on your knowledge of when a child typically reaches 100 cm in height. This occurs around 4 years of age.

Concept Tested & Keywords

Concept Tested: Normal growth and development milestones in children, specifically focusing on height.
Stem keywords: birth height, newborn, doubles
Lead-in keywords: BEST, MOST RELEVANT CLUE

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Practise the full NORCET 2 - 2021 (shift-1)

Attempt every question from this paper in a timed mock, then review the full solution for each one.