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Stages of pregnancy

HSE article for Stages of pregnancy

What to expect in the third trimester

The third trimester begins in week 28. Find out about preparations for birth and pregnancy-related conditions that may affect you during these weeks.

What to expect in the second trimester

The second trimester is from weeks 13 to 28 of pregnancy. Learn about physical and emotional changes you may experience during this time.

What to expect in the first trimester

Weeks 0 to 12 of pregnancy is called the first trimester. Learn about the things you need to do and the physical and emotional changes you may experience during these weeks.

  • 17 to 20 weeks pregnant

    You are still in the second trimester of pregnancy during week 17 to 20. By week 20 you are at the halfway point of your pregnancy. Learn more about how pregnancy is developing.

  • 37 to 40 weeks pregnant

    In the final weeks of pregnancy, your baby is ready to be born. Learn about what happens from weeks 37 to 40.

  • 21 to 24 weeks pregnant

    Your unborn baby is beginning to get into a pattern of sleeping and waking. Learn more about how your pregnancy develops from week 21 to 24.

  • 29 to 32 weeks pregnant

    You may be aware of lots of movements and they will usually be lying with their head pointing downwards by week 32. Learn more about how your pregnancy develops during these weeks.

  • 0-8 weeks pregnant

    The first 12 weeks of pregnancy is called the first trimester. Read a week-by-week guide on 0 to 8 weeks of pregnancy.

  • 9-12 weeks pregnant

    The first 12 weeks of pregnancy is called the first trimester. Read a week-by-week guide on 9 to 12 weeks of pregnancy.

  • 13 to 16 weeks pregnant

    The second trimester of pregnancy begins at week 13. Learn more about how your pregnancy develops from week 13 to 16.

  • 25 to 28 weeks pregnant

    25 to 28 weeks is the last stage of the second trimester. Learn more about how your pregnancy develops during these weeks.

  • 33 to 36 weeks pregnant

    As you approach the end of the third trimester, you may be gaining around 1lb a week and half of this will go to your unborn baby. Learn more about the developments from weeks 33 to 36.

  • Breast changes during pregnancy

    Find out the changes to expect in your breasts during pregnancy, and what you can do to reduce the symptoms.

  • Your baby's movements during pregnancy

    You will probably become aware of your baby's movements between 16 and 24 weeks of pregnancy. A baby's movements can be described as anything from a kick, flutter, swish or roll.