Your embryo now measures about 0.5 inches (1,5 cm) from crown to rump. Eyelids cover almost the entire eye, the nose sticks out, and arms and legs are growing quickly. The embryo is now moving carefully and exercising its muscles. The tail disappears.
During this period the reproductive organs start to develop into male or female. If the embryo has an X and a Y chromosome, this will result in the formation of testicles, a penis and a scrotum. If the embryo has two X chromosomes, fallopian tubes and a vagina will form.
The heart completes its development during this week. The baby still receives some nourishment from the yolk sac, but the placenta is increasingly taking over and the yolk sac starts to recede.
Your hormones can cause your skin to change. Some women find their skin becomes smoother, others get pimples. Some women also find that their mucous membranes become more delicate. Your gums may become sensitive and bleed more easily than usual, for instance. Good dental hygiene is particularly important during pregnancy.
Nasal congestion is common as well but avoid using nose drops if you can. Instead, try using a saline nasal spray, for example, from the drugstore. Another option is to use a cool mist humidifier in your room at night.
Tiny raised nodules known as the areolar glands, or Glands of Montgomery, may appear around your nipples.
No matter how strong and independent the mother-to-be usually is, she’ll probably need more support and attention from you during her pregnancy. Find ways to show her that you care and are there for her.
But this does not mean you should forget yourself and your own feelings. Co-parents can sometimes feel a bit left out. So many things focus on the mother-to-be, such as medical appointments, other people’s attention, and the physical changes. But remember, the two of you are having a baby together, and your role is important and significant too.