Newborn loses how much weight in first week?
**Core Concept**
Newborn weight loss in the first week is a normal physiological process, primarily due to the loss of excess fluids and the transition from fetal to neonatal circulation. This process is influenced by the newborn's initial weight, gestational age, and the presence of any underlying medical conditions.
**Why the Correct Answer is Right**
The correct answer is 5-10% of birth weight, which is a widely accepted range for normal newborn weight loss in the first week. This weight loss occurs due to the breakdown of excess glycogen stores and the loss of extracellular fluid. The newborn's kidneys start to function more efficiently, and the body begins to adapt to the new environment, leading to a decrease in fluid volume. The American Academy of Pediatrics recommends that newborns lose 5-10% of their birth weight in the first week, and this weight should be regained by the end of the second week.
**Why Each Wrong Option is Incorrect**
**Option A:** More than 10% of birth weight is considered excessive weight loss and may indicate underlying medical conditions such as dehydration, infection, or congenital anomalies. Newborns who lose more than 10% of their birth weight may require closer monitoring and medical intervention.
**Option B:** Less than 5% of birth weight is considered inadequate weight loss and may indicate that the newborn is not effectively transitioning to neonatal circulation. This could be due to various factors such as maternal diabetes, polycythemia, or congenital heart disease.
**Option C:** 15-20% of birth weight is an excessive range for normal newborn weight loss and is often associated with severe dehydration, infection, or other underlying medical conditions that require immediate medical attention.
**Option D:** No weight loss in the first week is not normal and may indicate that the newborn is not effectively transitioning to neonatal circulation. This could be due to various factors such as maternal diabetes, polycythemia, or congenital heart disease.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that a weight loss of 5-10% of birth weight in the first week is a normal physiological process, and most newborns will regain this weight by the end of the second week. However, any significant deviation from this range should prompt further investigation and medical evaluation.
**Correct Answer: D. No weight loss in the first week is not normal and may indicate that the newborn is not effectively transitioning to neonatal circulation.**