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1st Trimester 1-4 Weeks

1-4 Weeks Embryo Seven days after ovulation, the fertilized egg gradually implants itself in the uterus. By the 10th day, the embryo appears. The outer layer (the ectoderm) grows into the skin, eyes, ears, teeth, brain and nervous system; the middle layer (the mesoderm), will become the heart, blood vessels, muscles and reproductive organs; while the inner layer (the endoderm), will develop into the lungs, liver, bladder and digestive system. The embryo is between 0.5mm to 4mm in length and weighs approximately 0.4g. Pregnancy is dated from the first day of your last period,

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1st Trimester 5-8 Weeks

1st Trimester 5-8 Weeks Embryo Larger organs begin to take shape and form as the brain, facial features and limb joints become visible. Finally, pregnancy can be confirmed by sonar. The foetus is between 5 – 30mm in length and weighs approximately 2g by the end of the 8th week. All essential organs begin to form: limbs, fingers, toes and the tip of a nose develop. By the end of the month, the embryo becomes known as a foetus (“little one” in Latin). The embryo starts taking in oxygen from the placenta. Dramatic changes occur during this stage, the nervous

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1st Trimester 9-12 Weeks

1st Trimester 9-12 Weeks Foetus Now known as a foetus, its’ ears, nose and mouth take form on its relatively large head. The newly shaped eyes are covered with a skin that will soon become the eyelids, the eyelids are fused over the fully developed eyes. Arms and legs lengthen as the nails begin to grow, amazingly the foetus has unique fingerprints already by 10 weeks. The foetus’ fully developed heart now beats at just 170 – 175 per minute, much faster than an adults heart beat. Your baby’s embryonic “tail” has disappeared and the

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2nd Trimester 13-16 Weeks

2nd Trimester 13-16 Weeks Foetus Large organs are now fully formed, but still need to mature. Co-ordinated by its brain, the foetus can now stretch its arms and legs, and open its mouth, the foetus practices to breathe. Its face becomes more defined while the rest is covered with soft downy hair known as lanugo. The foetus is 10 to 15cm long – the size of a small avocado – and the body begins to catch up with the size of the head. Fingers and toes are defined and toothbuds begin to appear. Eyes are

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2nd Trimester 17-20 Weeks

2nd Trimester 17-20 Weeks Foetus The foetal eyes are still shut even as little eyelashes have appeared. Fluttering or stirring may now be felt from the growing foetal body movements. These are all important signs in a pregnancy, so make a special note of this day. The foetus is now about 20cm long, the size of a small bunny. The kidneys are producing urine, which is excreted into the amniotic fluid surrounding your baby, about 7-17 ml of urine every 24 hours pass through. At 20 weeks your baby’s head is about 1/3 of

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2nd Trimester 21-24 Weeks

2nd Trimester 21-24 Weeks Foetus Your breathing pushes amniotic fluid in and out of your baby’s lungs. A sense of balance is emerging thanks to a fully developed inner ear and muffled sounds can be heard from the outside world. Fused eyelids now separate into upper and lower lids, enabling your baby to open and shut his eyes. The tongue is now also developed with the all the taste buds. The brainwaves show that your baby is almost as active as a new born and reacts to sounds. Muscle and nerve connections begin forming. A

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3rd Trimester 25-28 Weeks

Your Baby in the 3rd Trimester Your baby is about 37.5cm long, weighing about 680-850g. The eyes are beginning to slowly open and close and the baby can now suck his thumb and he has a regular sleep cycle and even has dreams. The Lungs which were originally spongy/ solid are filling with air sacs , each wrapped in a network of blood vessels. The nerve fibre’s are now encased in myelin, a fatty substance that enables messages to travel faster along the nerves, thus boosting his ability to learn, remember and move. You and your body As you enter your third trimester, you may

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3rd Trimester 29-32 Weeks

3rd Trimester 29-32 Weeks Your Baby Your baby weighs about 2.25kg and is about 30.5 - 42.5cm long.  The layer of downy lanugo on his skin starts to fall off and the soft skin becomes a little less wrinkled as a layer of fat thickens.  Lungs are more developed; so much so that most babies born now can survive outside of the uterus.  He will spend most of his time asleep and his movements are strong and co-ordinated. He has probably assumed the ‘head down’ position by now, in preparation for birth. Your baby will

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3rd Trimester 33-36 Weeks

3rd Trimester 33-36 Weeks Your Baby Your baby weighs between 2.7 and 3.1 kg and will continue to steadily put on weight for the remainder of your pregnancy. The amniotic fluid reaches its highest level during week 33 then declines as baby takes up more space in your uterus. The baby’s head is now proportionate to its body, eyes focus and blink and become light sensitive. Organ systems are now working, the baby’s development is almost complete, ever day more fat cells are being laid down in a layer underneath the skin. You and

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3rd Trimester 37-40 Weeks

3rd Trimester 37-40 Weeks Your Baby By the end of week 37, the baby is considered full-term and could be born any time. Your baby has enough fat to maintain his body temperature. Get ready…. Your baby is on his way. During the last two months of the pregnancy, fifty-percent of the baby’s full term weight will be reached. The head is now firm and has the largest circumference of all body parts. Your baby has 300 bones whereas an adult only has 206, this will change as your baby’s bones will later fuse together.

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