Fetal development in the first trimester of pregnancy is a fascinating thing. While the most obvious fetal developments, at least to the outside observer, take place much later in pregnancy, it is during the first trimester of pregnancy that fetal development is the most significant. The first trimester of pregnancy is also the most critical time of your entire pregnancy, in terms of fetal development.

The first thing to keep in mind when you are considering fetal development in the first trimester is that every baby is likely to develop just a little bit differently. At the same time, just as there are certain developmental milestones that parents and teachers and pediatricians look for from children, there are certain milestones in terms of fetal development in the first trimester of pregnancy that need to be considered.

Generally speaking, by the sixth week of pregnancy, you can detect a fetal heartbeat with a vaginal ultrasound. Alternatively, you may be able to detect a fetal pole. A fetal pole is your baby at its very smallest, and actually has the shape of the head of the fetus at one end, and what would appear to be a tail at the other end. The crown of the fetal head should be between 2 and 4 mm.

By the seventh week of pregnancy, the heart of the fetus is beating and can be seen on an ultrasound. From here, fetal development becomes very rapid. Over the next several weeks, right up until the end of the first trimester, your baby’s organs are developing more and more. By the age of two months, the fetus has developed to the size of a kidney bean, and is almost in constant motion. At this point, he has also developed distinct, but webbed, fingers. Over the next month, up until the end of the first trimester, your baby will grow to about three inches long, and will develop her own unique fetal fingerprints by the end of the first trimester.

Posted in Pregnancy

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