Stages Of Pregnancy Week By Week

A Pregnancy Lasts For 40 Weeks From The First Day Of Your Last Menstrual Period (LMP) To The Birth Of The Baby.

It Is Divided Into Three Stages, Called Trimesters.

First Trimester- (1st to 12th Weeks),

Second Trimester- (13th to 27th Weeks),

Third Trimester- (28th to 40th Weeks until Birth)

Observe the changes that occur to both mother and baby during each Trimester.


First Trimester – Week 1 Conception to Week 12

Changes in the woman’s body is the first sign that you are pregnant. A missed period may be the first sign you are pregnant. Other changes also occur like:

  • Physical and Emotional changes.

  • Hormonal changes will affect every organ in the body.

  • Fatigue.

  • Tender and swollen breasts, Nipples may protrude.

  • Cravings or aversions from eating

  • Mood swings

  • Constipation

  • Frequent Urination

  • Headache

  • Weight Gain

Some women experience a lot of discomfort, and others may not feel any at all. Each pregnancy is different and even if you’ve been pregnant before you may feel completely different with each subsequent pregnancy.

4th Week: Your Baby is developing

  • The nervous system and heart (brain and spinal cord) Formation begins.

  • Arm and leg buds start developing.

  • Baby at this stage is an embryo and 1⁄25 of an inch long.

    8th Week: Embryo begins to develop into Fetus

  • Major organs of the baby begin to form

  • Heartbeat forms

  • Arms and Legs start growing

  • Fingers and Toes begin to form

  • Sex organ formation

  • Face and features start developing

  • umbilical cord is visible

ovlo-Pregnancy Ovulation Test Kit

12th Week: Growth of the Baby

  • Nerves and muscles begin to work together. Your baby can make a fist.

  • The external sex organs show if your baby is a boy or girl.

  • Eyelids close to protect the developing eyes. They will not open again until week 28.

Second Trimester – Week 13 to Week 28

Symptoms like nausea (morning sickness) and fatigue may pertain and also changes in your body. “Baby bump” will show as your abdomen expands with the growing baby. By the end of the second trimester you will even be able to feel your baby move.

Changes in your body are like as follows:

  • Back, abdomen or thigh aches or pains.

  • Stretch marks on your abdomen, breasts and thighs

  • Darkening of the skin around your nipples

  • A line on the skin running from belly button to pubic hairline.

  • Patches of darker skin, usually over the cheeks, forehead, nose, or upper lip.

  • Itching on the abdomen, palms, and soles of the feet – Consult your doctor immediately

Baby at the 16th Week

Your baby continues to develop:

  • Musculoskeletal system formation continues.

  • Skin begins to form and is nearly translucent.

  • Me-conium develops in your baby’s intestinal tract-Baby’s first bowel movement.

  • Sucking motions with the mouth.

  • Baby is about 4 to 5 inches long and weighs almost 3 ounces

Baby at the 20th Week:

Your Baby is:

  • Active. Feeling of movements and kicking.

  • Your baby is covered by fine, feathery hair called lanugo and a waxy protective coating called vernix.

  • Eyebrows, eyelashes, fingernails, and toe-nails have formed.

  • Baby can hear and swallow.

  • Baby is about 6 inches long and weighs about 9 ounces.

Baby at the 24th Week:

  • Baby’s bone marrow starts to make blood cells.

  • Taste buds formation on your baby’s tongue.

  • Footprints and fingerprints have formed.

  • Hair begins to grow on your baby’s head.

  • The lungs are formed, but do not yet work.

  • Your baby has a regular sleep cycle.

  • If your baby is a boy, his testicles begin to descend into the scrotum. If your baby is a girl, her uterus and ovaries are in place, and a lifetime supply of eggs has formed in the ovaries.

Third Trimester – Week 29 to Week 40 Birth

Final stage of Pregnancy. As the baby grows and puts more pressure on your internal organs, you may find you have difficulty breathing and have to urinate more frequently. This is normal and once you give birth these problems will go away.

Changes in this stage:

  • Swelling of the ankles, fingers, and face- Consult your doctor immediately.

  • Hemorrhoids- These are clumps of dilated (enlarged) blood vessels in the anus and lower rectum. Symptoms such as itching, mucus discharge, burning at the anus, severe pain, a sensation that the bowel is not really empty, and bleeding without pain.

  • Tender breasts, which may leak a watery pre-milk called colostrums.

  • Your belly button may stick out.

  • The baby “dropping,” or moving lower in your abdomen.

  • Contractions, which can be a real sign or false labor call.

  • Other symptoms you may observe are: shortness of breath, heartburn, and difficulty sleeping.

Baby at 32nd week:

  • Baby’s bones are soft and formed.

  • Movements and kicking increase.

  • Eyes can open and close.

  • Lungs are not fully formed, but practice “breathing” movements occur.

  • Your baby’s body begins to store vital minerals, such as iron and calcium.

  • Fine Hair begins to fall off.

Baby at 36th week:

  • The protective waxy coating (vernix) thickens.

  • Body fat increases.

  • Your baby is getting bigger and has less space to move around.

  • Baby is about 16 to 19 inches long and weighs about 6 to 6½ pound.

Baby at 37th to 40th week:

  • Baby is fully formed.

  • Baby’s organs are capable of functioning on its own.

  • Nearing your due date, your baby may turn into a head-down position for birth.

  • Average birth weight is between 6 pounds, 2 ounces to 9 pounds, 2 ounces and average length is 19 to 21 inches long. Most full-term babies fall within these ranges, but healthy babies come in many different weights and sizes.

This leads to beginning of Motherhood and Childcare

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