In this week of pregnancy, your twins weigh about 100 grams each, and the length of each one is 10 cm from the head to the bottom of the hips. Their unique fingerprints have been formed so far. When you gently tap their belly, they will feel it and may start screaming silently or sucking whatever is in front of them (hands - feet - umbilical cord). This sucking reflex is a practice for breastfeeding after birth. If one or both of them are girls, they now have 2 million eggs in their ovaries, which will decrease to 1 million by the time they are born. Now their bodies are growing faster than their heads. Their papery skin is covered with fluff-like cotton. Eyebrows and head hair begin to sprout, but their color and texture may change after birth. The legs are longer than the arms. Fingernails are fully formed. And all joints and organs have the ability to move. The reproductive system is complete to the extent that the sex of your children can be recognized by ultrasound. Their ossification has a cartilaginous state that will be strengthened later. Myelin, which is a protective substance, begins to wrap around the spinal cord. The chest of the twins rises and falls and mimics breathing. But instead of air, amniotic fluid (the fluid inside the water sac) is drawn into the lungs. which helps to grow their lungs. Your twins start to have hiccups. This hiccup strengthens the diaphragm, the diaphragm is a muscle that we need to breathe after birth. Sometimes you may have a slight pain in the side. This can be due to the stretching of the ligaments on the side of the uterus and the pelvic wall, which will cause the birth of your children and the enlargement of the uterus. This pain is normal, but if it continues for a few days or becomes severe, you should talk to your doctor. Toes: Toenails begin to grow. Head: Your children's heads now stand higher than before and the shape of their skulls becomes more complete if their hair has not yet started to grow. Blood vessels: Your children's circulatory system is working perfectly. And their heart pumps about 24 liters of blood per day.