Formative

1. 1 month end of week 4

1.1. The first month of pregnancy is actually the 2 nonpregnant weeks after you started your last period, plus the first 2 weeks you are pregnant, the size is about 1,5mm, At 4 weeks of pregnancy, the cells have flattened into a three-layered disc. Each layer has different types of cells.

2. 2 months end of week 8

2.1. The embryo starts out looking like a tiny seed, then a tadpole with a tail, and then more human by the end of the month. When you are 6 weeks pregnant, your embryo has the beginnings of a brain, eyes, ears, heart, lungs, liver, and other organs the size is about 11-14 mm, When you are 8 weeks pregnant, the heart and brain have divided into their major parts.

3. 3 months end of week 12

3.1. About 10 weeks pregnant the embryo has nearly all of the body structures that an adult has. The brain is now more complex. After this point, we call this tiny being a fetus. If you are worried about Down syndrome, you may be able to have a special ultrasound and a blood test as early as 10 weeks the size is about 61mm.

4. 4 months end of week 16

4.1. the face has become more "human." The eyes have moved from the sides of the head to the front. The ears have moved from the neck to the sides of the head, When you are 15 to 20 weeks pregnant, you can get a triple or quad serum screen. This is a simple blood test for signs of a possible birth defect. the size is about 120mm and the weight 104.5g

5. 5 months end of the week 20

5.1. the head is no longer so big compared to the rest of the body. You can see bones on ultrasound by the end of week 17, the size is about 160mm and the weight is about 304g your fetus is still small enough to change position a lot-from head-down to feet-down, or even sideways.

6. 6 months end of week 24

6.1. the fetus is still building up body fat and starting to put on a lot of weight. At 23 weeks of pregnancy, the eyes show rapid eye movement.In rare cases, babies survive birth at 22 weeks the size is about 210mm the weight is about 598.5g

7. 7 months end of week 28

7.1. a fetus can still move around a lot-from head-down to feet-down, or even sideways. You will notice more movement or less movement at certain times of the day and night. the lungs are starting to make surfactant, which helps the lungs breathe air. the size is about 250mm and the weight is about 950g

8. 8 months end of week 32

8.1. The fetus is putting on a lot of weight this month a fetus is still small enough to change position a lot-from head-down to feet-down, or even sideways. You will notice more movement or less movement at certain times of the day and night, The lungs and central nervous system are working well enough that a baby born the size is about 300 mm and the weight 1995g

9. 9 months end of week 36

9.1. your fetus is probably still small enough to change position a lot-from head-down to feet-down, or even sideways. the size is 320mm and the weight is about 2300g,If your baby is born at a healthy weight during this month, chances of healthy survival are very good.

10. End of week 40

10.1. the time a baby is born at term, fat makes up 16% of body weight. The baby's growth has slowed in the last days before birth. At this size, your baby does not have much room to move around. the size is about 360mm and the weight is about 3230g