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A fetal weight reference tool based on NICHD Asian singleton data, helping expectant parents quickly assess their baby's growth.
If you are wondering whether your baby's growth is on track, this tool provides the NICHD standard fetal weight reference values for Asian singleton pregnancies. Organized by gestational age (10 to 42 weeks), it displays the reference ranges for fetal weight at the 3rd percentile (low), 50th percentile (standard), and 97th percentile (high) in grams. This helps you quickly determine where your baby's weight falls within the population distribution.
Q: What is the standard fetal weight at 28 weeks?
A: 1,132 grams. The median weight (50th percentile) for an Asian singleton fetus at 28 weeks is 1,132 grams, with a normal range between 910 grams and 1,408 grams.
Q: What is the clinical significance of the 97th percentile weight?
A: This value indicates that only 3% of fetuses at the same gestational age weigh more than this amount. If ultrasound measurements consistently exceed this threshold, it is necessary to comprehensively evaluate the risk of macrosomia by considering other indicators such as abdominal circumference and head circumference. We recommend consulting an obstetrician for a growth curve analysis.
This chart is only applicable to Asian singleton pregnancies. For multiple pregnancies or non-Asian populations, please consult professional medical institutions for relevant data. These reference values should be used in conjunction with ultrasound measurements, as actual weight estimates are influenced by the measuring equipment and formulas used. Any abnormal values must be comprehensively evaluated by a doctor in combination with clinical indicators such as fundal height and abdominal circumference.
In clinical practice, it is recommended to track the trend of weight percentile changes over consecutive weeks, as this is more meaningful than a single measurement. For example, if the measurement at 28 weeks is at the 30th percentile (approx. 1,050g) and rises to the 60th percentile (approx. 1,800g) at 32 weeks, it may indicate catch-up growth, requiring attention to nutritional intake and umbilical blood flow parameters.
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