At the 21st week of pregnancy, it can already be considered that you are in the second half of your pregnancy, you will feel happy and full, although at times tired and trying to find new ways to maintain balance because the volume of your belly does not stop growing, due to the increase in the volume of the uterus. As for the baby, its digestive system matures, to the point that the small intestine can absorb very small amounts of nutrients; yes: its food comes mainly from the placenta and reaches it through the umbilical cord.
It highlights the formation of the sexual organs that your gynecologist will surely have appreciated in the second trimester ultrasound: in boys, the testicles descend to the scrotum and in girls the vagina is formed. Human gestation is fascinating, although I have repeated this dozens of times, I am still impressed by the great changes that transform this set of cells that form an embryo, which later becomes a fetus and after birth will be your baby. It is also important to note that the body (the bone marrow in particular) already forms red blood cells.
If now you think that the movements do not let you rest at night, wait for it to grow more and occupy most of the uterine cavity :), but it is nothing you cannot go through, because the most certain thing is that above the discomfort you will feel like a full mother and a powerful woman. And the best thing is that you already notice the little kicks that 'it will be giving you', it is a wonderful sensation that replaces that kind of bubble that you noticed inside, and it was nothing but the baby sliding and performing various movements. It weighs approximately 330 grams, and measures about 27 centimeters.
Changes in the mother too
With a 19-week-old baby (remember that to calculate the duration of pregnancy the first day of the last menstruation, But fertilization occurs about 15 days later). You may feel the need to buy maternity clothes (those pants with an elastic waist are no longer wide enough, and the loose top is starting to tighten), as well as looking for special panties and bra. Weight gain is completely normal, as long as it is not excessive, pay attention to the midwife, eat balanced y do moderate exercise.
During the day take a nap (if you are a newcomer, the children around the house give work) since you may suffer insomnia at night. Some of your organs will have to re-accommodate with the growth of your uterus: the intestines move, the bladder is pressed. Any discomfort you notice about it is completely normal. The most common complaints are lack of sleep at night, fatigue, and pain caused by round ligament strain.
In week 21, cordocentesis when deemed necessary and appropriate.