Fetal Growth: What to Expect at 7 Weeks Pregnant

Ultrasound two weeks after conception?

Hello doctor, I would like to ask about my girlfriend.
She had her period on November 2nd and we had intercourse on December 12th.
During that period, we only had intimate relations once.
On December 29th, we had an ultrasound and the fetus was already 1.44 cm at 7 weeks and 5 days.
Is it normal for the fetus to grow that quickly?

Xiao Lai, 30~39 year old female. Ask Date: 2021/01/24

Dr. Wu Xianghui reply Obstetrics and Gynecology

The gestational age of the fetus is calculated from the first day of the last menstrual period.
From November 2, 2020, to December 29, 2020, it is approximately 8 weeks, which closely aligns with the ultrasound results.

Reply Date: 2021/01/24

More Info

At 7 weeks pregnant, fetal growth can vary, but the size you mentioned—1.44 cm (or approximately 14.4 mm)—is within the normal range for that stage of pregnancy. Typically, by this point, the embryo is expected to measure between 1.5 cm to 2.0 cm in crown-rump length (CRL). Your observation that the fetus is measuring at 1.44 cm suggests that it is developing appropriately, especially considering that you are at 7 weeks and 5 days gestation.

Fetal growth is a complex process influenced by various factors, including genetics, maternal health, and environmental conditions. The embryo undergoes rapid changes during the first trimester, particularly between weeks 6 and 10, when significant development occurs. By the end of the 7th week, the embryo is starting to take on a more recognizable shape, and the heart is typically beating, which can often be detected via ultrasound.

Regarding your question about whether the fetus can grow that quickly, it's important to note that fetal growth is not linear. During early pregnancy, the embryo can experience periods of rapid growth, and slight variations in size are common. The measurements taken during an ultrasound are estimates, and there can be slight discrepancies based on the technician's technique or the position of the embryo during the scan.

In terms of what to expect at this stage, many women experience various symptoms due to hormonal changes. Common symptoms include breast tenderness, fatigue, nausea, and mood swings. These changes are primarily driven by increased levels of hormones such as human chorionic gonadotropin (hCG), progesterone, and estrogen, which support the pregnancy and prepare the body for the developing fetus.

It's also worth noting that while fetal size is an important indicator of health, it is not the only one. Regular prenatal check-ups are crucial for monitoring the overall health of both the mother and the fetus. During these visits, healthcare providers will assess not only fetal growth but also maternal health, including blood pressure, weight gain, and any potential complications.

If there are any concerns about fetal growth or development, such as discrepancies in size or unusual symptoms, it is advisable to consult with a healthcare provider. They may recommend additional ultrasounds or tests to ensure that the pregnancy is progressing normally.

In summary, at 7 weeks pregnant, a fetal size of 1.44 cm is normal and indicates healthy growth. Regular monitoring and communication with healthcare providers will help ensure that both the mother and baby remain healthy throughout the pregnancy.

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