When does the infant's weight get double in relation to birth weight?

Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Child Health Nursing (Pediatrics)

Easy

Appeared in: Combined AIIMS - 2020 (Jodhpur, Bhopal, Patna, Raipur)

Explanation

A healthy, full-term infant typically doubles their birth weight by the age of 5 months.
This milestone is a key indicator of adequate nutrition and healthy development during the first year of life, which is a period of very rapid growth.
According to WHO growth standards, an infant weighing 3.2 kg at birth will weigh approximately 6.4 kg by 4 months and 6.9 kg by 5 months, confirming that doubling occurs within this timeframe.

Option B: By 8 months, a healthy infant's weight has already significantly surpassed double their birth weight and is on track to triple it by one year.
Option C: At 10 months, an infant's weight is much closer to being triple their birth weight, not double.
Option D: At 12 months, or 1 year, the standard developmental milestone is tripling the birth weight, not doubling it.

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, specifically weight gain as background academic context rather than a clinical decision trigger.
Monitoring an infant's weight is a fundamental part of pediatric nursing care. It is one of the most important measures used to assess nutritional status, hydration, and overall health.
Failure to meet weight gain milestones can be an early indicator of 'failure to thrive,' which may be caused by inadequate caloric intake, feeding difficulties, gastrointestinal problems, or other underlying medical conditions.
What if? - If an infant has not doubled their birth weight by 6 months, it is considered a clinical red flag. The nurse should conduct a thorough assessment of feeding practices, calculate caloric intake, and report the findings to the pediatrician for further evaluation and potential intervention.

How to Approach the Question

First, identify the core of the question: it's asking for a specific developmental milestone related to infant weight.
Recall the standard rules of thumb for infant growth. The most common are doubling and tripling of birth weight.
Remember that the most rapid period of growth is in the first six months. This helps narrow down the possibilities.
Recall the specific milestone: birth weight doubles around 5-6 months and triples by 1 year.
Compare this knowledge with the given options. '5 months' is the only option that aligns with the milestone for doubling birth weight.

Concept Tested & Keywords

Concept Tested: Infant growth and development milestones, specifically weight gain.
Stem keywords: infant's weight, double, birth weight
Lead-in keywords: When does
Clinical cues: Age/sex group narrows the expected diagnosis, intervention, or normal reference range.
Negative lead-in flag: false

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