Main Event: The heart starts beating.
• At this stage, the rapid growth of the embryo occurs. The neural tube that runs along his back is fully formed and is closing. The brain and spinal cord are growing rapidly.
• The heart begins to work: at this time it will push the blood at a speed of 100 - 130 beats per minute, but not yet rhythmically. Pretty soon it will beat evenly and even faster - up to 170 - 180 beats per minute. From the 9th week of pregnancy, the fetal heart rate (heart rate) will gradually decrease, but will remain significantly higher than the maternal one - 120 - 160 beats per minute.
• The initial outlines of the face appear: eyes, nose, ears are formed.
• The rudiments of the upper and lower limbs are formed: the arms and legs look like small kidneys.
• The amniotic sac is already well developed. The embryo (and later the fetus) will remain in it throughout the pregnancy, comfortably suspended in the amniotic fluid, at a constant temperature and protected from shocks and shocks.
Embryo dimensions: 5 - 10 mm in length.