How big is the fetus at one month of pregnancy?

Many women start to worry about the size of their baby one month into their pregnancy. The excitement of being a first-time mother is understandable. In order to help everyone answer the question of how big the fetus is one month into pregnancy, we have also consulted experts in obstetrics and gynecology. If you also want to know the common sense in this area, just read on and you will find out. I hope that through the editor's introduction, everyone can have a general understanding.

During the first month of pregnancy (1-4 weeks), the expectant mother's endometrium is affected by the hormones secreted by the ovaries, becoming thick, soft and rich in nutrients. The blood vessels dilate gently and the water is sufficient. The fertilized egg continues to divide cells and moves into the uterine cavity to form a solid cell mass called a morula. At this time, the fertilized egg is called a blastocyst. When the peripheral zona pellucida disappears, the blastocyst contacts the endometrium and buries itself in the endometrium, which is called "implantation". Implantation usually begins 6 to 7 days after fertilization and is completed within 11 to 12 days.

The brain has already begun to develop during this period - one week after the egg is fertilized, the fertilized egg continues to divide, part of which will form the brain and the other part will form neural tissue. The fertilized egg before 9 weeks of pregnancy is called the "germ" or "embryo". This week, you can see through B-ultrasound that its shape is like a small pine nut. The week of germ development is the "embryonic period", and the embryonic cells divide at an astonishing rate within a few weeks.

One month of pregnancy fetal development indicators

Fetal size

The embryo is still in a very immature stage of development, only 0.36-1 mm long, but many changes have already occurred.

development

During the first month of pregnancy, neural ducts appear in the ectoderm, from which the spinal cord, brain, nerves, etc. will come in the future. In the middle layer the heart and circulatory system have emerged. In the inner layer, the urinary system, intestines, lungs and other organs begin to form.

other

The placenta, villi and umbilical cord that supply nutrition to the fetus in the early stage also begin to work at this time.

Now everyone should have a clear answer to the question of how big the fetus is one month into pregnancy. In fact, what pregnant women need to do is to have regular check-ups as arranged by the doctor. If the size of the baby is far from the standard, the doctor will inform you. If you experience any discomfort during your pregnancy, you should seek medical attention immediately.