The weight of an infant baby becomes twice the birth weight at the age of?

RRB Staff Nurse Kolkata-2015

Child Health Nursing (Pediatrics)

Easy

Appeared in: RRB Staff Nurse Kolkata-2015

Explanation

According to standard pediatric growth milestones, an infant's birth weight doubles by approximately 5 to 6 months of age.
This rapid increase in weight during the first six months is a primary indicator of adequate nutrition and healthy development.
Since 5 months is not an option, 6 months is the most accurate answer provided.
An average Indian newborn weighs about 3 kg at birth and is expected to weigh around 6 kg at 6 months.

Option B: At 1 year of age, an infant's birth weight is expected to triple, not double.
Option C: By 2 years of age, a child's birth weight is expected to quadruple, not double.
Option D: At 3 years of age, a child's weight is approximately five times their birth weight. The rate of weight gain slows considerably after the first year.

Visual 1: Infographic - A clear visual chart showing an infant at birth, 6 months, 1 year, and 2 years, with labels indicating the weight multiplication factor (2x, 3x, 4x) at each stage. This provides a quick, memorable reference.
Visual 2: Chart - A WHO (World Health Organization) growth chart for infants (weight-for-age). The visual can highlight the steep curve in the first 6 months, visually demonstrating the rapid weight gain, and then show how the curve's slope decreases over the next few years.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Infant growth and development milestones (weight) as background academic context rather than a clinical decision trigger.
Tracking infant weight is a fundamental nursing assessment to monitor nutritional status and overall health. Deviations from the expected growth pattern can be the first sign of a problem.
Nurses use growth charts to plot weight, length, and head circumference at each well-child visit to identify trends and provide anticipatory guidance to parents about feeding and development.
What if? If an infant has not doubled their birth weight by 6-7 months, a nurse must initiate a 'failure to thrive' assessment. This involves a detailed dietary history, observation of feeding, screening for illness or malabsorption issues, and evaluating psychosocial factors at home.

How to Approach the Question

First, identify the core of the question. It's asking for a specific factual milestone in infant development: the doubling of birth weight.
This is a direct recall question. Access your knowledge of standard pediatric growth patterns.
Recall the key rules for infant weight gain: weight doubles by 5-6 months, triples by 1 year, and quadruples by 2 years.
Compare this rule to the options provided.
The 'doubling' milestone matches the '6 months' option. The other options correspond to tripling (1 year) and quadrupling (2 years) of weight.
Select the option that correctly aligns with the doubling of birth weight.

Concept Tested & Keywords

Concept Tested: Infant growth and development milestones (weight).
Stem keywords: infant, baby, weight, birth weight, twice
Lead-in keywords: at the age of
Clinical cues: Age/sex group narrows the expected diagnosis, intervention, or normal reference range.

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