How big is the baby at four months of pregnancy?

Mar 28, 2023 Source: Cainiu Health

Dr. Lv Aiming

Introduction

At four months of pregnancy, the baby's size is approximately that of a citrus fruit. Individual differences in fetal growth and development lead to variations in body length, weight, biparietal diameter, and femur length. According to color ultrasound examination, the fetus measures 10–18 cm in length, weighs 40–160 g, has a biparietal diameter of 3.23 ± 0.5 cm, and a femur length of 1.74 ± 0.58 cm.

Generally, at four months of pregnancy, the baby's weight is approximately 40–160g and the body length is about 10–18cm. The details are as follows:

At four months of pregnancy, the baby's size is roughly comparable to that of an orange. Due to individual differences in fetal growth and development, there may be variations in body length, weight, biparietal diameter, and femur length. Color ultrasound examinations typically show a fetal length of 10–18cm, weight of 40–160g, biparietal diameter of approximately 3.23±0.5cm, and femur length of about 1.74±0.58cm. At this stage, the fetus is undergoing rapid growth and development; the respiratory system gradually matures, and the genital organs become clearly visible.

If the fetal weight is significantly above or below the normal range, it is necessary to verify whether the estimated due date based on the last menstrual period is accurate, and also consider possible issues such as accelerated or delayed intrauterine fetal development.

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