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DEVELOPMENT OF FETUS

TRIMESTER 1 FROM WEEK 1 TO 13

1 WEEK

This is week one of your pregnancy, but you're not officially pregnant yet. It might seem confusing.

2WEEK

At the start of this week, you ovulate. Your egg is fertilized 12 to 24 hours later if a sperm penetrates it.  A few days later, you could notice some light spotting. It might look like your period, but it's actually a sign that the fertilized egg has attached itself to the wall of your uterus.

3WEEK

Ball, called a blastocyst, has begun to produce the pregnancy hormone HCG, which tells your ovaries to stop releasing eggs.  Sperm and egg have officially merged into one single cell, called a zygote. Your child's sex and all of her inherited genetic characteristics -- such as eye color, hair color, skin, and body type have been set since the moment of conception.

4 WEEK

Your ball of cells is now officially an embryo.  A fluid-filled cushion called the amniotic sac is forming. It will surround and protect your baby while they grow.

5 WEEK

 The embryo now has three distinct layers. The circulatory system is beginning to form, and the tiny heart.

6 WEEK

Baby’s nose, mouth and ears are starting to take shape, and the intestines and brain are beginning to develop. Your child's heart will beat about 150 times a minute twice the average adult rate. 

7 WEEK

Your baby is already developing distinct facial features. Dark spots mark the areas where her eyes and nostrils will be, and a little mouth and ears are starting to form, too.

8 WEEK

Feeling more tired than usual. Breathing tubes now extend from his throat to his developing lungs.

9 WEEK

Baby has doubled in size and her head, which is about half the length of her entire body. The reproductive organs are forming.  Start gaining weight fast.

10 WEEK

That early appendage is now completely gone. Also gone is the webbing between baby's fingers and toes.

11 WEEK

 Fetus will start to inhale and exhale.  She's kicking, stretching, and even hiccupping as her diaphragm develops, although you can't feel any activity yet. Baby still only measures just 2 inches long from the top of the head to the rump.

12 WEEK

As your baby's muscles start to bulk up at this stage, he's getting busy stretching and kicking. By now your baby looks like a fully formed person. Inside, more organs are developing. 

13 WEEK

 You’re over any morning sickness you had.  All of your baby's essential organs and systems have formed.

2nd TRIMESTER FROM 14 WEEK TO 27

It's a good time to start a regular pregnancy fitness routine. Your baby will grow quickly in the second trimester. You will be able to feel this. It will put pressure on your lungs, stomach, bladder, and kidneys. You may begin to feel your baby move during the fifth month.

3RD TRIMESTER FROM WEEK 28 TO 42

Early in your third trimester, your baby may begin to recognize the sound of you and your partner’s voices. You might be peeing more often or have leg cramps as he presses on nerves in your hips and back.

Towards the end of the third trimester, your baby's position changes to prepare itself for labor and delivery. The baby drops down in your pelvis, and usually their head is facing down toward the birth canal.

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