How big is a four-month-old fetus?

Jan 25, 2025 Source: Cainiu Health

Dr. Zhang Lu

Introduction

Under normal circumstances, a four-month-old fetus usually has a body length of 15–16 cm, a weight of approximately 110–150 grams, a crown-rump length of about 12–13 cm, and a biparietal diameter of around 3–4 cm. Pregnant women should maintain healthy lifestyle and dietary habits during pregnancy, and undergo regular prenatal checkups to ensure the fetus's healthy development. If any discomfort occurs, prompt medical consultation is recommended.

At four months, a fetus typically has a body length of 15-16 cm and a weight of 110-150 grams, although specific measurements may vary. Detailed analysis is as follows:

At four months, the fetus's body length is typically 15-16 cm, with a weight of 110-150 grams, a crown-rump length of 12-13 cm, and a biparietal diameter of 3-4 cm. The facial features of a four-month-old fetus are largely developed and clearly distinguishable, including visible eyes, nose, mouth, and ears. Additionally, fine hair begins to grow on the scalp, and the fetus starts to exhibit breathing movements. The skin is thin and appears deep red, with no subcutaneous fat present. Some pregnant women may begin to feel fetal movements at this stage, although these movements are typically not very pronounced. However, the size of a four-month-old fetus can be influenced by multiple factors, such as the mother's nutritional status and the fetus's genetic makeup, so some variation in measurements is expected.

During pregnancy, expectant mothers should maintain healthy lifestyle and dietary habits and undergo regular prenatal screenings to ensure healthy fetal development. If any discomfort or concerns arise, prompt medical consultation is recommended.

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Why is fetal movement more frequent at night than during the day?

Under normal circumstances, increased fetal movement at night compared to daytime may be caused by factors such as the fetus's sleep cycle, maternal attention levels, gestational hypertension, gestational diabetes, or fetal hypoxia in utero. If any discomfort occurs, it is recommended to seek timely medical evaluation and treatment at a正规 hospital. In daily life, maintain regular作息, avoid staying up late, follow a balanced diet, and manage body weight appropriately.

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Does a heating stove emit radiation, and is it safe for pregnant women to use?

A standard-brand electric oven (such as far-infrared or convection type) emits mostly non-ionizing radiation, which is low in intensity and within safety standards, posing no risk to the fetus. Pregnant women can safely use such ovens if maintaining a distance of more than 1 meter, limiting each use to less than 1 hour, and ensuring good ventilation. Under these conditions, using the oven can help relieve discomfort from cold without health risks.

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What should I do if microcephaly is detected at 37 weeks of pregnancy?

At 37 weeks of gestation, if microcephaly is detected, it is essential to promptly complete further examinations, evaluate fetal development, consult with multidisciplinary specialists, develop a delivery plan, and prepare for postnatal interventions. A rational approach should be taken to avoid panic. If tests indicate severe complications or abnormalities in the fetus, timely medical consultation and adherence to professional diagnostic and treatment recommendations are advised.

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What impact does fungal infection during pregnancy have on the baby?

Fungal infections during pregnancy may lead to intrauterine infection, skin infection, respiratory tract infection, eye infection, or impaired fetal development in the baby, with varying degrees of impact depending on the type of infection; timely intervention is required. If symptoms of fungal infection occur during pregnancy or an infection is suspected, prompt medical evaluation and treatment are recommended. Severe fungal infections during pregnancy, such as candidemia, may invade the fetus through the placenta.