The expected height of a normal child at 12 months is?

Appeared in: AIIMS Bhopal NO - 2018 (Shift-1st)

Explanation

The average length of a full-term newborn is approximately 50 cm.
During the first year of life, an infant's length increases by about 50% of their birth length, which is an addition of roughly 25 cm.
Therefore, the expected length of a child at 12 months (1 year) is calculated as 50 cm (birth length) + 25 cm (first year growth) = 75 cm.

Option B: This length is significantly below the average length even for a newborn at birth (50 cm). A measurement of 45 cm at 12 months would indicate severe growth faltering.
Option C: This is the average length of a child at birth, not at 12 months. A child who is still 50 cm at 1 year would have shown no linear growth, indicating a serious health problem.
Option D: This height is the expected average for a 4-year-old child. It represents a doubling of the birth length.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pediatric Growth Milestones: Height/Length as background academic context rather than a clinical decision trigger.
Monitoring height/length is a fundamental component of pediatric health surveillance. It helps in tracking growth patterns and identifying potential issues like failure to thrive, malnutrition, or certain genetic conditions.
Nurses use standardized growth charts (such as those from the WHO or IAP) to plot measurements. A child's growth curve should ideally follow a consistent percentile line. Crossing percentiles downwards is a red flag.
What if? If a 12-month-old child's length was only 65 cm and they had dropped from the 50th to the 5th percentile on the growth chart, this would be classified as growth faltering. The nurse's priority would be to assess feeding history, nutritional intake, and screen for underlying health issues, followed by referral.

How to Approach the Question

First, identify the key parameters in the question: the measurement is 'height' (or length for an infant) and the age is '12 months'.
Recall the standard growth milestones for infants. The most fundamental fact to remember is the average length at birth, which is approximately 50 cm.
Apply the rule of thumb for growth in the first year: length increases by about 50% of the birth length (which is an addition of ~25 cm).
Calculate the expected height: 50 cm (at birth) + 25 cm (growth in first year) = 75 cm.
Check the other options against known milestones to confirm your answer. 50 cm is at birth, and 100 cm is at 4 years, which makes 75 cm the only logical choice for 12 months.

Concept Tested & Keywords

Concept Tested: Pediatric Growth Milestones: Height/Length
Stem keywords: expected height, normal child, 12 months
Lead-in keywords: is
Clinical cues: Age/sex group narrows the expected diagnosis, intervention, or normal reference range.

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E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 10-12

Practise the full AIIMS Bhopal NO - 2018 (Shift-1st)

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