Which of the following is NOT true regarding the birth weight of a newborn?

AIIMS BBSR SNO - 2019

Child Health Nursing (Pediatrics)

Medium

Appeared in: AIIMS BBSR SNO - 2019

Explanation

The statement is false because the clinical threshold for investigating a newborn's low birth weight is not defined as 'less than 5% of normal'.
The correct and standard criteria are a birth weight below 2500 grams (Low Birth Weight, LBW) or a weight that falls below the 10th percentile for the baby's gestational age (Small for Gestational Age, SGA).
Using a vague term like '5% of normal' is clinically imprecise and not a standard for diagnosis or intervention.

Option B: This statement is correct. The typical birth weight for a healthy, full-term infant generally falls within the range of 2.7 to 4.0 kg. The provided search results state a similar range of 2.5 to 3.9 kg.
Option C: This statement is correct. It is a normal physiological process for newborns to lose up to 10% of their birth weight in the first few days of life. This is primarily due to the excretion of meconium and excess extracellular fluid.
Option D: This statement is correct. A healthy newborn who is feeding well should regain their initial birth weight by about the 10th day of life, and sometimes as early as the 7th day.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Normal and abnormal parameters of newborn birth weight, including physiological weight loss and criteria for investigation as background academic context rather than a clinical decision trigger.
Accurate assessment of newborn weight is a fundamental nursing responsibility. It is crucial for identifying at-risk infants who may have underlying health issues, feeding problems, or dehydration.
Nurses must educate parents about the expected physiological weight loss to prevent anxiety and discourage unnecessary formula supplementation, which can interfere with establishing breastfeeding.
Failure to regain birth weight by two weeks is a red flag that requires prompt investigation into feeding effectiveness, potential illness, or metabolic disorders.

How to Approach the Question

First, identify that the question is a 'negative' question, asking for the statement that is NOT true. This means three of the options will be correct facts.
Read each option carefully and evaluate its clinical accuracy based on your knowledge of neonatal care.
Option A uses a vague term 'less than 5% of normal'. Clinical standards are usually precise. This should be a red flag.
Options B, C, and D describe common, well-known parameters of newborn weight: the normal range, initial weight loss, and the time to regain weight.
Compare the options. The most likely incorrect statement is the one that uses non-standard, imprecise terminology (Option A). The other options describe expected physiological norms.
Confirm by recalling that 'Small for Gestational Age' (SGA) is defined by the 10th percentile, not a '5% of normal' value. This confirms Option A is the false statement.

Concept Tested & Keywords

Concept Tested: Normal and abnormal parameters of newborn birth weight, including physiological weight loss and criteria for investigation.
Stem keywords: newborn, birth weight
Lead-in keywords: NOT true
Negative lead-in flag: The question asks for the statement that is NOT true, requiring identification of the false information among the options.

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