Pregnancy Trimesters

A normal pregnancy, measured from the first day of the last menstrual period, lasts about 40 weeks (three trimesters). The fetus reaches certain developmental milestones at the end of each trimester of pregnancy.

A full-term baby can be born between 37 and 42 weeks, with 40 weeks being the average.

Although exact timing may vary, the following describes the three trimesters as defined by the Office on Women’s Health Reliable Sources:

  • 1-12 weeks is the first trimester.
  • 13-28 weeks into the second trimester
  • 29-40 weeks the third trimester

First Trimester (1-12 weeks) 

Your baby will develop the most in the first three months of pregnancy. Your baby undergoes significant physical and physiological development during this time. Many pregnancies end in miscarriage, and many more are affected by birth defects, during this time.

During the first trimester of pregnancy, you’ll also see significant changes in your body. A wide range of symptoms, from nausea and fatigue to breast tenderness and frequent urination, can result from these shifts. These are all fairly typical signs of pregnancy, but every woman has a unique experience. Some people may feel energized during this time, while others may struggle with exhaustion and mood swings.

Second Trimester (13-28 weeks)

Pregnancy’s second trimester is often referred to as the “golden period” because it’s when most women report feeling “back to normal” after the initial discomforts of pregnancy have subsided. Pregnancy’s second trimester is when most women feel the most like themselves, with fewer morning sicknesses, improved sleep, and boundless reserves of energy. On the other hand, you might start experiencing brand new symptoms, such as backache, tummy ache, leg cramps, constipation, and heartburn.

It’s possible to feel your baby’s first kicks anywhere from 16 weeks to 20 weeks.

Third Trimester (29-40 weeks)

You’re probably feeling a mix of excitement and anxiety as you enter the final weeks of your pregnancy. Physical symptoms such as shortness of breath, hemorrhoids, urinary incontinence, varicose veins, and trouble sleeping are all possible during this time. Many of these changes occur as your uterus grows from its original size of about 2 ounces to about 1.4 kg by the time of birth.


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  • 1

    Pregnancy is always a little unsteady in the first month. You don't know what to do, and you're hungry, but you don't know what to eat either. The pregnancy's outcome is frequently decided in the first month.
  • 2

    Congrats! Your second month of pregnancy has begun. Though most pregnant women still don't know it at this point, those who do are extremely cautious about what they eat. Proper nutrition is crucial for the fetus's healthy growth during this period.
  • 3

    Sometimes, getting to the third month of pregnancy seems unreal. You have, in a sense, reached safety: the first trimester is over, you are feeling more confident, and you have begun sharing your wonderful news with others.

1st Trismester

0.4kg - 2.0kg
  • 4

    After the third month, you will notice significant shifts in your mental, physical, and emotional states. The treatment you receive throughout your fourth month of pregnancy can vary substantially and will require many more checkups.
  • 5

    In the 5th month, it's possible that your little one may start to show signs of being a bit more active, with kicks and flips finally becoming evident. Your infant is now starting to fall asleep and wake up at more consistent intervals.
  • 6

    You're in the final stretch of your second trimester of pregnancy by the time you reach six months. Even if you're experiencing normal pregnancy symptoms, you may feel energised and eager about the impending birth of your kid.

2nd Trismester

2.0kg - 8.0kg
  • 7

    Now that you're seven months along, you've entered the third trimester of pregnancy. Your baby is hard at work at seven months pregnant, creating the organs and systems she/he will need to thrive once she/he is born.
  • 8

    It's been a long journey, but now that you're eight months pregnant, you have a lot to look forward to. There is little time left in your pregnancy now. Your baby's third trimester is a time of rapid development and weight gain.
  • 9

    Yes! This is the final stretch of your pregnancy, and soon the big day will arrive. Though you and your baby may still have some developing to do, the time for delivery is rapidly approaching, even if your baby isn't exactly full term.
*units in weeks

3rd Trismester

8.0kg - 13.6kg

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