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Pregnancy Weeks – A pregnancy has three trimesters

How many weeks are there in a pregnancy period?

There are about 280 days or 40 pregnancy weeks. It is calculated from the first day of your menses till the birth of the baby. Some pregnancies also reach up-to 49 weeks.

How many weeks are there in a trimester?

There are about 13 to 14 pregnancy weeks per trimester. A pregnancy has three trimesters.

  • First trimester: 1 to 13 weeks approx.
  • Second trimester: 14 to 27 weeks approx.
  • Third or Last Trimester: 28 to 40 weeks approx.

Terms of pregnancy cycle

The American College of Obstetricians and Gynaecologists (ACOG) determines the following terms of pregnancy cycle.

  • Preterm: 20-37 weeks
  • Early term: 37 weeks 0 days-38 weeks 6 days
  • Full term: 39 weeks 0 days-40 weeks 6 days
  • Late term: 41 weeks 0 days-41 weeks 6 days
  • Post term: after 42 weeks 0 days

Pregnancy weeks 0 to 8

Three weeks after the first day of your last period, your fertilised egg moves slowly along the fallopian tube towards the womb in the starting days.

Pregnancy weeks 9, 10, 11, 12

The face starts to form and the eyes are more obvious and have some colour in them. You might still be feeling tired and sick, but for many women this should clear up soon.

Pregnancy weeks 13, 14, 15, 16

At 14 weeks, the baby is about 85mm long from head to bottom. If you have been feeling sick and tired, you’ll probably start to feel better when you’re around 13 or 14 weeks pregnant.

Pregnancy weeks 17, 18, 19, 20

The body of the baby grows bigger so the head and body are more in proportion.

Pregnancy weeks 21, 22, 23, 24

When you’re 24 weeks pregnant, the baby has a chance of survival if they’re born. Most babies born before this time can’t live because their lungs and other vital organs aren’t developed enough.

Pregnancy weeks 25, 26, 27, 28

The baby begin to follow a pattern for waking and sleeping. Very often this is a different pattern from yours, so when you go to bed at night, the baby may wake up and start kicking.

Pregnancy weeks 29, 30, 31, 32

By about 32 weeks of the pregnancy the baby is usually lying with its head pointing downwards, ready for birth.

Pregnancy weeks 33, 34, 35, 36

The bones of the baby start to harden now, even though the skull bones will stay soft and separated to make the journey through the birth canal easier.

Pregnancy weeks 37, 38, 39, 40

The amniotic fluid turns into waste, known as meconium, in the baby’s intestines, and the soft hair named lanugout that covered your baby’s body is now almost all gone.

Points to consider when you are pregnant

You must follow these points during your pregnancy to give a birth to a healthy baby.

•You should stay active during your pregnancy weeks and exercise is the best way to reduce stress, improve blood circulation, control the weight and sleep better. You must do exercise for 15-20 minutes daily at a moderate pace according to your pregnancy.

Childbirth classes

•If it’s your first baby, you must attend the childbirth classes to learn how to grow a healthy child take care of him.

Stop the intake of toxins

•Eliminate the intake of every toxic products like alcohol, tobacco, harmful chemicals , cigarettes and each and every product that can harm the baby. If you are addicted of any of the toxic habit, you can consult the doctor to leave those habits.

Normalise the weight

Your overweight can make the child grow underweight and can also create many developmental problems in the baby. You should check your weight daily and make sure your weight remains normal during pregnancy period.

  • Underweight: Gain 28-40 pounds
  • Normal weight: Gain 25-35 pounds
  • Overweight: Gain 15-25 poundsuhjObese: Gain 11-20 pounds
  • 1 to 4 pounds total in the first 3 months
  • 2 to 4 pounds each month from 4 months until delivery


Abubakar is a writer and digital marketing expert. Who has founded multiple blogs and successful businesses in the fields of digital marketing, software development. A full-service digital media agency that partners with clients to boost their business outcomes.