All about Pregnancy

       Your pregnancy week-by-week  
 



Reliable information on
pregnancy topics
by Heisje de Jong,
Certified Lactation Consultant

Welcome (home page)
Your pre-conception diet
Home pregnancy tests
Early signs of pregnancy
Diet for your pregnancy
Things to give up
Lifestyle changes
Childbirth classes
Breastfeeding - preparation
Complications during pregnancy
Prenatal testing
Pregnancy Week-by-Week
When to contact your doctor
What to ask your obstetrician
Hospital or home delivery?
    And your Packing Guide!

Pain relief in labor & birth
Medical intervention during
    labor and delivery

Post partum exercises
Breastfeeding


About Heisje de Jong
Useful links
Contact Heisje

 


 

   

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The development of the embryo begins from the moment the sperm and egg meet in the Fallopian tube. Immediately after the egg has been penetrated, it starts to divide. It divides repeatedly while it travels along the fallopian tube to the uterus. This journey takes about one week. By this time, the egg has become a mass of cells called a blastocyst. When the blastocyst reaches the uterus it starts embedding itself into the uterus lining and gets a new source of nutrition by opening into your blood vessels. During this stage, you do not know yet that you are pregnant because you have not missed a period yet. During the second week of the fertilized egg's life the mass of cells begin to form into an amniotic sac, the beginning of the embryo and another group of cells become the placenta. At this point, you are about one week past the date you expected your period and you are suspecting you may be pregnant and perhaps you have done already a pregnancy test to confirm your pregnancy.

WEEK 5
Although the embryo is now 3 weeks old, pregnancy is dated medically from the first day of your last period so you are now considered 5 weeks pregnant. You are one week past the date of your expected period. Your breasts are slightly enlarged and tender. You may have a slight backache or even abdominal pain may occur and give you the idea that your period is about to come. The embryo is now about 2 mm long and is visible to the naked eye. The spine, head and trunk are beginning to take shape. At this stage, the embryo looks like a tiny seahorse.

WEEK 6
The embryo has rudimentary eyes and ears, a brain and a heart, which is already beating. Tiny limb buds are beginning to appear and its blood circulation is beginning to function.
You may be feeling sick in the mornings and you may need to pass urine more often than usual.

WEEK 7
Your baby is now about 1-3 centimeters long. His limb buds are developing rapidly and look like tiny arms and legs but the hands and feet are no more than ridges yet. The baby has visible lips and nostrils.
You may feel dizzy at times, especially when you have to stand for a long time.

WEEK 8
All the major organs of your baby have formed now though they are not fully developed yet. Eyes and ears are growing now. The heart is beating strongly. When you have an ultrasound during this time, you can see the fetal heart pulsating.
You may dislike certain foods. Many women go off coffee during pregnancy, especially in the first months. Likewise, you may desire foods you normally do not like. Your breast are enlarged and the areola becomes darker and develops little nodules (Montgomery's tubercles). Start wearing an adjustable well supporting bra.

WEEK 9
The baby is moving now although you will not be able to feel this yet for quite some time. His fingers and toes are developing and knees and elbows appear. The weight of the baby at this point is about 2 grams. The head is huge in relation to its body.
You may have some light vaginal discharge. This is normal as long as it is not itchy or painful. Your gums may be softening or even bleeding because of the pregnancy hormones. Take care of your oral hygiene and visit your dentist at least a few times during your pregnany.

WEEK 10
Your baby is now 4-5 cm long and weighs about 5 grams. The umbilical cord is formed. The placenta begins to produce progesterone but the baby does not rely on the placenta for nourishment yet. This will be around the 12th week. Your uterus has the size of an orange now although it does not show yet.

WEEK 11
Your baby is now about 5.5-cm long and weighs 10 grams. It's testicles or ovaries have been formed as well as all major organs. These organs will not develop much further but will only continue to grow during the rest of the pregnany. Now the baby is relatively safe from the risk of developing congenital abnormalities. Your baby is now classified as a fetus and not longer as an embryo.
Any morning sickness you may have had should be disappearing from now on. The amount of blood that circulates through your body has started to increase. Your breathing is more rapid during pregnancy and you may find that you are sweating more than usual due to the extra blood in your system. This is all normal and nothing to worry about.

WEEK 12
Your baby is now about 6,5 cm long and weighs about 18 grams. His head is becoming more rounded and the face is completely formed. Toes and fingers are formed and nails are beginning to grow. The baby is moving it's limps but you can not feel this movements yet.

WEEK 13
Any complaints of tiredness you may have had will be disappearing from now on. You will probably feel energetic and active. Your baby is now completely formed. From now on he will be growing and growing until he is mature enough to be born. The baby is now about 7.5 cm and weighs 30 grams.

WEEK 14
Hair starts to appear on your baby's head and it has eyebrows now as well. During antenatal visits, you will be able to hear your baby's heartbeat.
Your uterus is now so enlarged that it begins to protrude out of your pelvis. Your clothes will be getting too tight for you but it is not necessary to wear maternity clothes yet. Do not cram yourself into too tight clothing. Buy some comfortable loose clothes with an elastic waist.

WEEK 15
Your baby is growing rapidly now. The neck has lengthened and his head is not so bent on the chest. The baby drinks some of the amniotic fluid and can pass urine. The placenta is working now and the baby receives all it's nourishment from it.

WEEK 16
Your baby is now about 16-cm long and weighs 35 grams. During a scan, you can see the baby's head and body and you may see the baby moving. It is exercising all his limbs, kicking and moving about. This is the earliest stage at which you may feel the baby moving. It feels like there is a butterfly in your belly. However, do not worry if you don't feel anything yet. If this is your first baby, you are likely to feel the first movements a bit later.

WEEK 17
The baby is covered with a fine down, called lanugo. The baby is also covered with vernix, a greasy substance that protects his skin. Its face gets features that are more human although the eyes are still large and spaced far apart. Your waistline starts to disappear and your nose may feel congested. Some women even experience nosebleeds. You may also have an increase in vaginal discharge.

WEEK 18
Your baby is now about 20 cm long and moving actively. He is kicking, grasping and sucking, some babies suck their thumb. If this is your first baby, you will probably feel the baby moving inside you by now.

WEEK 19
The baby is still swimming around in a large amount of amniotic fluid. He is growing rapidly, both in length and weight. It makes some very active movements that can be felt by you. You will probably notice that there are times when your baby seems to be asleep and other times when he's moving about a lot.

WEEK 20
The baby is now 25 cm long, half as long as it will be at delivery and weighs about 340 grams. Your belly is growing now and it defenitely shows that you are pregnant.

WEEK 21
Some women experience heartburn during pregnancy. If you do, ask your doctor for some antacid tablets. While you move around during the day, your baby seems often asleep, rocked asleep by your movements. When you lie down he often wakes up and starts kicking.

WEEK 22
The baby weighs about 450 grams. He is still moving about freely in the amniotic fluid. Your belly is growing and your chest is expanding to make space for the growing baby.

WEEK 23
You may be able to see your baby's movements and when you place your hand on your belly you can feel him kicking and moving about. Your partner will enjoy feeling the baby too. Many women have trouble sleeping when they are getting heavier. Using some extra pillows for support may help. A massage with aromathic oils just before going to sleep is relaxing as well.

WEEK 24
Your baby is about 32 cm long now and weighs 500 grams. You can feel different parts of the baby's body through your abdominal wall. Your uterine muscle is stretching and you may feel a pain sometimes at the side of your tummy. The top of your uterus reaches to just above your navel.

WEEK 25
You may notice that your baby reacts to loud noises or to music. You may need to go to the toilet more often than usual because your baby is pressing against your bladder.

WEEK 26
You are putting on weight regularly. You may notice that you are putting on weight on your buttocks as well as your belly.
The baby's skin is gradually changing; it is becoming opaque instead of transparant. His skin is still much wrinkled but is protected by the layer of vernix.

WEEK 27
The baby is growing rapidly and is almost filling all the available space in the uterus. At some time during the seventh month, most babies turn upside down. When you see your baby's movements on your belly, you may be ably to distinguish the different body parts, bottom, foot or knee.

WEEK 28
Your baby is now legally viable. That means he is capable of independent life, although his lungs are not mature yet. If your baby would be born during this time he would be premature, but would have a good chance of survival. The baby is now 38cm long and weighs about 900 grams.

WEEK 29
You are now in your third trimester. This trimester affects each woman differently. Some women feel tired and exhausted and wish the birth to be over. Other women remain active and energetic as before. Now may be a good time to start shopping for the things you need to buy for your baby. If you postpone it much longer, you may be too heavy to enjoy your shopping spree.

WEEK 30
You may notice some colostrum leaking from your breasts. This is normal, don't start squeezing it out. It's important to wear a well supporting bra. If you are planning to breastfeed your baby, you could buy a few adjustable nursing bras. Your belly is heavy now and you should always try to maintain good posture to avoid getting a backache. Don't slouch on the couch as you used to do but make sure your back is well supported. Some women prefer to sit on the floor tailor style with their back supported against a chair or couch.

WEEK 31
Your baby's head is now in proportion with the rest of his body. You may feel pressure on your diaphragm, stomach and intestines. To relieve this pressure temporarely stretch your arms upwards. Like this, you are lifting your ribs off your expanding uterus. Your baby's weight is now about 1800 grams.

WEEK 32
The baby is now perfectly formed. He only needs some lung surfactant and a layer of body fat before he is ready to be born. Sometimes your baby may move in a spasmodical manner. This is usually because your baby has an attack of hiccups. You may be getting breathless when climbing stairs or taking long walks. Do not over exert yourself. Take a rest when your body asks for it.

WEEK 33
Your baby is by now too big to be swooping around in the amniotic fluid and stays more or less in one position, usually head down by now. The movements you feel now are prods and kicks. They may be so vigorous that they make you catch your breath!

WEEK 34
You are probably attending antenatal classes by now. Try to practice the relaxation techniques and breathing exercises at home. They will help you to relax during labour and you will be better able to cope with the contractions. They can help you during the rest of your pregnancy to relax and to cope with any aches and pains you may have.

WEEK 35
The baby measures about 44cm now and weighs around 2.5 kg. Your baby's skin is smooth now and his body has plumped out. When the baby is awake his eyes are open and he can differentiate between light and dark. By the end of this week clinic visits are probably every week.

WEEK 36
Your baby is almost fully mature. Any time now he may descend into your pelvis. Once the baby has engaged you may find that your breathing becomes easier and the pressure on your diaphragm is less. You may need to pass urine more often because the uterus is now pressing against your bladder. The last few weeks of pregnancy may be tiring and you may be anxious for the birth to be over. Make sure you have an overnight bag packed for the hospital. Your baby is now about 50cm long and weighs anywhere from 2.5 to 4.5 kg.

WEEK 37
If your baby is born at this time, your baby has an excellent chance of survival. Your baby may be moving less now. You will probably feel less big body movements, especially after he has engaged, because there is no longer enough room in the uterus. You may only feel the kicking of his legs and arm movements. You should feel some movement every day though.

WEEK 38
Your baby's bowel contains meconium, a black sticky substance that will be his first bowel movement after birth. Some babies excrete the meconium during birth. Your Braxton Hicks contractions may be quite strong during this time and you may even confuse them for the real ones. Real labour contractions however increase in strenght and frequency over time.

WEEK 39
Your baby is ready to be born. The long awaited day is near and soon you will be holding your baby in your arms. Your baby has lost his lanugo hair although you may still find some at his back and on his forehead. Your baby's eyes will be blue at birth but this can change in the weeks to come.

WEEK 40
Any day now your labour may start. Do not worry if your baby is not born exactly on his due date. The due date is only a statistic means. Only 5 % of the babies are born exactly on their due dates. Some babies arrive a bit earlier, others a bit later, but they do arrive! So, much luck and happiness with the new baby in your life!

 

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