Birth weight of a newborn baby is 3 kg. What is the expected weight of the baby at 1 year of age?

Appeared in: TMC Staff Nurse - 2019

Explanation

The standard rule for infant growth is that a baby triples their birth weight by their first birthday.
Given the birth weight of 3 kg, the expected weight at 1 year is calculated as 3 kg × 3 = 9 kg.
This is a key developmental milestone used in pediatric nursing to assess for adequate growth and nutrition.

Option A: A weight of 6 kg represents a doubling of the 3 kg birth weight.
Option C: A weight of 12 kg represents a quadrupling of the 3 kg birth weight.
Option D: A weight of 15 kg is five times the birth weight.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Infant growth and development, specifically weight milestones as background academic context rather than a clinical decision trigger.
Monitoring weight gain against standard growth charts is a fundamental nursing responsibility during well-child visits to screen for nutritional deficiencies or excesses.
Failure to triple birth weight by one year is a significant red flag for 'Failure to Thrive' (FTT), prompting a deeper investigation into feeding practices, underlying health conditions, and psychosocial factors.
What if? If the same 3 kg baby weighed only 7 kg at the 1-year check-up, the nurse's priority action would be to conduct a detailed dietary history and feeding assessment, followed by educating the parents on age-appropriate nutrition and scheduling a follow-up.

How to Approach the Question

First, identify the key data points in the question: the infant's birth weight (3 kg) and the target age (1 year).
Next, recall the standard pediatric growth milestone for weight at one year of age.
The rule of thumb is that an infant's weight typically triples by the end of the first year.
Apply this rule to the given birth weight: 3 kg × 3 = 9 kg.
Finally, compare your calculated result (9 kg) with the provided options and select the matching one.

Concept Tested & Keywords

QrSTY-wCb_NODYvdSHGPXJ

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

E6 Nutrition Kumud Khanna 2e p. 109-111

Practise the full TMC Staff Nurse - 2019

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