# Situation: A nurse from the Rural Health Unit (RHU) makes postnatal home visits to healthy term infants and their mothers during the first weeks after discharge from a lying-in clinic. The mother of a 5-day-old exclusively breastfed term boy is worried because he weighs less than he did at birth. He breastfeeds often and has 6 wet diapers daily. By what age does a healthy breastfed term newborn usually regain his birth weight?

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=629426  
> language: ko  
> subject: Nursing Practice II — Maternal and Child Health Nursing

## 문제

Situation: A nurse from the Rural Health Unit (RHU) makes postnatal home visits to healthy term infants and their mothers during the first weeks after discharge from a lying-in clinic.

The mother of a 5-day-old exclusively breastfed term boy is worried because he weighs less than he did at birth. He breastfeeds often and has 6 wet diapers daily. By what age does a healthy breastfed term newborn usually regain his birth weight?

## 보기

1. By 3 to 5 days of age
2. By 3 to 4 weeks of age
3. By 10 to 14 days of age **✔ 정답**
4. By 6 to 10 weeks of age

**정답: 3**

## 해설

Healthy term newborns lose up to about 7 to 10% of their birth weight in the first days as they pass meconium and lose extra body fluid. With effective feeding, birth weight is regained by about 10 to 14 days. This infant is feeding often and has enough wet diapers, so the loss is expected.

## 심화 해설

Why the newborn loses weight first

A healthy term infant normally loses weight during the first few days after birth. The loss comes from passing meconium, shifting of extra extracellular fluid, and a relatively small early milk intake before full lactogenesis. This initial drop is expected and is not by itself a sign of feeding failure.

In a healthy term newborn, a weight loss of up to about 7–10% of birth weight is considered within the expected range. In breastfed infants, the median maximum loss is around 6%, which is higher than the median of about 3.5% seen in formula-fed infants [1]. The difference reflects the normal timing of maternal milk coming in and the lower initial volume of colostrum.

When birth weight is regained

With effective feeding, the newborn begins to gain weight after the nadir, and birth weight is typically regained by about 10 to 14 days of age. This timeline is the key point for the nurse to teach the mother. A 5-day-old infant who is still below birth weight is within the expected period of physiologic loss, not yet delayed.

The infant in this situation is feeding frequently and has 6 wet diapers daily. Adequate urine output is a reassuring sign of sufficient milk intake. Frequent feeding also supports milk production and early regain of weight. These observations make the weight loss expected rather than concerning.

Watch out! Regaining birth weight by 3 to 5 days is too early for most breastfed term newborns. By 3 to 4 weeks or 6 to 10 weeks is too late and would require evaluation for inadequate intake, poor milk transfer, or an underlying problem.

Clinical interpretation for the home visit

The nurse should explain that the current weight is part of the normal postnatal curve. The mother’s report of frequent feeding and normal wet diaper count supports continued exclusive breastfeeding. Follow-up weight checks should be arranged to confirm that the infant is moving toward birth weight by the second week of life.

| Age | Expected weight pattern in healthy term newborn |
| --- | --- |
| First 3–5 days | Physiologic weight loss, usually up to 7–10% of birth weight |
| About 10–14 days | Birth weight regained with effective feeding |
| After 14 days | Steady weight gain; delayed regain requires assessment |

Key point! The normal timing of regaining birth weight is the same concept used in growth monitoring. A breastfed newborn who is still below birth weight at day 5 with good feeding and urine output is usually following the expected curve, not failing to thrive .References (research sources)

- [1]Neonatal weight loss in breast and formula fed infants.Research articleMacdonald PD, Ross SR, Grant L, Young D (2003) · DOI: 10.1136/fn.88.6.f472

## 임상 시나리오

Newborn Weight Monitoring in Breastfed InfantsExpected early loss and timely regain
A healthy term newborn may lose up to 7-10% of birth weight in the first days from meconium passage and loss of extra body fluid. This is physiologic weight loss, not a sign of feeding failure.

With effective feeding, birth weight is usually regained by 10 to 14 days of age. A 5-day-old infant still below birth weight is within the expected period of loss.

Reassuring signs of adequate intake include frequent breastfeeding and 6 wet diapers daily. These support milk production and early regain of birth weight.

CautionRegaining birth weight by 3 to 5 days is too early for most breastfed term newborns. Delayed regain beyond 14 days warrants evaluation of feeding adequacy, milk transfer, and possible underlying illness.

## 핵심 개념

- **Physiologic weight loss** — Normal initial drop in newborn weight during the first days after birth, usually up to 7-10% of birth weight, due to meconium passage and loss of extra extracellular fluid.
- **Birth weight regain** — Return to birth weight after the initial postnatal weight nadir; expected by about 10 to 14 days in healthy term breastfed newborns.
- **Lactogenesis** — The onset of copious milk production; full lactogenesis typically occurs around 2 to 4 days postpartum, influencing early newborn weight changes.
- **Colostrum** — The small volume, nutrient-dense first milk produced before full milk comes in; supports the newborn while milk supply increases.
- **Adequate urine output** — A clinical sign of sufficient milk intake; about 6 wet diapers daily is reassuring in a breastfed newborn.

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