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Updated: Feb 7, 2026

How to Obtain Reliable Visual Event-related Potentials in Newborns
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[Weight decrease in full-term newborns in the first 48 hours post natal].

Miguel Gallardo López1, Esteban Gallardo Cadenasso2, Laura Gallardo Cadenasso3

  • 1Unidad de Neonatología, Clínica Dávila, Chile.

Revista Chilena De Pediatria
|July 13, 2018
PubMed
Summary
This summary is machine-generated.

Newborns lose an average of 4.43% weight on day one and 2.51% on day two. Cesarean delivery increases weight loss, while formula feeding decreases it compared to breast milk.

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Area of Science:

  • Neonatal Health
  • Pediatrics
  • Clinical Research

Background:

  • Newborns (NB) typically experience physiological weight loss post-birth.
  • The exact magnitude and influencing factors of this weight loss remain subjects of study.
  • Limited data exists regarding newborn weight loss in our specific region.

Purpose of the Study:

  • To quantify the daily percentage of weight decrease in healthy, full-term newborns within the first 48 hours of life.
  • To investigate the influence of gender, delivery type, gestational age adequacy, and feeding method on newborn weight loss.

Main Methods:

  • A prospective study involving 2960 healthy, full-term newborns (>37 weeks gestation).
  • Weight measurements were recorded at birth, 24 hours, and 48 hours.
  • Weight loss percentages were calculated daily and overall, with analysis of influencing factors including delivery method and feeding type (breast milk, formula, or mixed).

Main Results:

  • Average weight loss was 4.43% on day 1 and 2.51% on day 2, totaling 6.85% at 48 hours.
  • Cesarean section delivery was associated with significantly greater weight loss compared to other delivery methods.
  • Newborns fed with artificial milk formula exhibited less weight loss than those exclusively breastfed (BM).

Conclusions:

  • Daily newborn weight loss percentages in this study align with international findings.
  • Cesarean delivery is identified as a key factor contributing to increased newborn weight loss.
  • The use of milk formula appears to mitigate newborn weight loss compared to breastfeeding.