What is considered a low birth weight baby?

Appeared in: NIMHANS Nursing Officer - 2021

Explanation

A low birth weight (LBW) baby is defined by the World Health Organization (WHO) as a newborn weighing less than 2500 grams (2.5 kg) at birth.
This definition applies regardless of the baby's gestational age, meaning it includes both preterm infants and full-term infants who are small for their gestational age.
The measurement should ideally be taken within the first hour of life before significant postnatal weight loss occurs.

Option A: This describes a baby with a normal or average birth weight.
Option C: While a baby weighing less than 2000 gm is indeed low birth weight, this is a more specific sub-classification and not the general threshold for LBW.
Option D: A birth weight of 1500 gm falls into the specific category of 'Very Low Birth Weight' (VLBW).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition and classification of low birth weight (LBW) as background academic context rather than a clinical decision trigger.
Identifying LBW is critical for nurses as these infants are at a significantly higher risk for complications such as hypothermia, hypoglycemia, respiratory distress, and infections, requiring close monitoring and specialized care.
Nursing care for LBW infants prioritizes thermoregulation (e.g., Kangaroo Mother Care), nutritional support (frequent feeds), and strict infection control measures.
What if? If a baby weighs 1400g, they are classified as Very Low Birth Weight (VLBW). This escalates the level of care required, often necessitating admission to a Neonatal Intensive Care Unit (NICU) for respiratory support, intravenous nutrition, and more intensive monitoring than a standard LBW infant.

How to Approach the Question

This is a factual recall question that tests your knowledge of a standard medical definition.
First, identify the core concept: 'low birth weight'.
Recall the internationally accepted weight threshold for this classification.
Evaluate the options against this standard definition. The key is to remember the specific value of 2500 grams.
Eliminate options that represent normal weight or more specific sub-categories of low birth weight.

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 2 — Subpart A (pp 1-232 of 464) p. 30-32

E6 Text Book Of Pediatric Nursing 3rd Panchali Pal — Part 1 (pp 36-238 of 713) p. 177-179

E6 Midwifery Obstetrics and Gynecology Nursing Sandeep Kaur p. 7-12

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