This is the size of the baby in the 12th week, the development of these organs is complete

From the time of conception till delivery, the development of the baby in the mother’s womb continues continuously. There is an increase in the development of the baby in every week of pregnancy and you can know how much development has happened in which week. In this article, Dr. Santosh Kumar, Pediatrician and Neonatologist, Motherhood Hospital, Banashankari, Bengaluru, is telling how much the baby has developed and what is its size in the 12th week of pregnancy.

continuous development


Dr. Santosh says that the human fetus develops continuously inside the womb from conception to delivery. Before birth, a baby has to go through several developmental stages as it develops from a blastocyst to an embryo and then to a fetus in the mother’s womb. There are many stages in the development of the baby.

12 week pregnancy baby size

Compared to the last three weeks, the size of the baby has already doubled. Its weight is around 15 to 20 grams and its length is 6 to 8 cm in the 12th week. This week marks the critical period for the baby. By this time most babies are fully formed but there is still a lot to happen in their development.

what is development

Reflexes, facial features, and gut development begin at this time. The work of new body structure is completed. The organs begin to function and the system continues to develop for the next 28 weeks. By this week, white blood cells start being manufactured by the bone marrow. Hormones are also made in the baby’s body from the pituitary gland.

what are you doing baby

According to, at 12 weeks, the baby’s head is half the length of its body. The length of his arms is now more normal than before but the legs are still short. Kidney function has started and the baby has started swallowing and urinating amniotic fluid. Now the baby is trying breathing movements and his digestive system has also started functioning. Baby is constantly moving and stretching, yawning. The heart is beating fast and you can hear it even without a heart monitor.

movement will not be felt

According to the National Health Service, you will not be able to feel the baby’s movement yet. You may have cramps or abdominal pain from time to time. No need to worry about it. However, you may get a buzz during this time. The size of the baby in the womb is increasing and it needs more space now than ever before. Due to this, the size of your uterus is increasing and now your baby bump will also start showing.