Now around 2 inches long and the size of a plum (about 2.5 inches/6cm), your baby weighs about half an ounce and is growing rapidly. At 12 weeks pregnant the head is still about one third of the size of the rest of the body but the brain development is now slowing down and the rest of the body will catch up.
The head and neck are still straightening up at this point and your baby’s posture is becoming less curled up.
Arms, legs, fingers and toes are elongating and tapering into more recognisable shapes. Your baby is practising breathing using amniotic fluid to prepare the lungs for air respiration.
She is also developing reflexes and will begin to open and close its fingers, eyes and mouth. The kidneys will now be excreting tiny amounts of urine. The majority of this waste will be transferred to your system, but a small amount will mix with the amniotic fluid and then be breathed in by the baby. Don't worry- the urine is totally harmless.
Baby's face now looks totally human as the eyes have moved from the sides to the front of the face.
Your uterus has grown to the point where the top of it can now be felt just above your pubic bone. At 12 weeks pregnant you may or may not yet be in maternity clothes depending mainly on whether this is your first pregnancy.
It is quite common to be experiencing heartburn at this stage. This is due to the high amount of progesterone in your body. Progesterone is responsible for relaxing the valve between your oesophagus and stomach and this then allows gastric acid to travel back up and cause a burning sensation.
The intensity can vary considerably from mildly irritating to quite uncomfortable. Try to eat smaller meals and avoid spicy and highly seasoned food.
What to expect at week 13 of your pregnancy...