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9-13 Weeks Pregnant : Baby Development in The First Trimester

9 13 Weeks Pregnant, Baby Development In The First Trimester (33)

Week 9

The face is slowly forming. The eyes are bigger and more obvious and have some color (pigment) in them. There are a mouth and tongue, with tiny taste buds. The hands and feet are developing — ridges identify where the fingers and toes will be, although they haven’t separated out yet. The major internal organs (such as the heart, brain, lungs, kidneys, and gut) continue developing.

At nine weeks of pregnancy, the baby has grown to about 22mm long from head to bottom and weighs under 10g.

9 13 Weeks Pregnant, Baby Development In The First Trimester (5)

Week 10

The ears are starting to develop on the sides of your baby’s head, and inside the head, its ear canals are forming. If you could look at your baby’s face you would be able to see its upper lip and two tiny nostrils in the nose. The jawbones are developing and already contain all the future milk teeth. The heart is now fully-formed. It beats 180 times a minute — that’s two to three times faster than your own heart. The baby is making small, jerky movements which can be seen on an ultrasound scan.

Week 11

The fetus grows quickly and the placenta is rapidly developing (it will be fully formed at about 12 weeks). The bones of the face are formed now. The eyelids are closed, and won’t open for a few months yet. The earbuds look more like ears as they grow. Your baby’s head makes up one-third of its length, but the body is growing fast — it is straightening, and the fingers and toes are separating. There are fingernails.

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Week 12

Just 12 weeks after your last period, the fetus is fully formed. All its organs, muscles, limbs and bones are in place, and the sex organs are well developed. From now on, it has to grow and mature. It’s too early for you to be able to feel the baby’s movements yet, although it’s moving quite a bit. Your baby’s skeleton is made of tissue called cartilage and, around now, this starts to develop into hard bone.

Week 13

Your baby weighs around 25g.

Your baby’s ovaries or testes are fully developed inside their body, and the genitals are forming outside their body. Where there was a swelling between the legs, there will now be a penis or clitoris growing, although you usually won’t be able to find out the sex of your baby at an ultrasound scan at this stage. Even the fingerprints are now formed.

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