First Trimester

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1st Trimester: Conception through Week 12

There's a lot going on in your body as your baby begins to develop and your pregnant body starts to go through some (big!) changes. Here's more about what to expect in the first trimester of pregnancy.

Your Body:
  • Your menstrual periods have stopped and you may have morning sickness at any time during the day or night.
  • You may gain 3-5 pounds by the end of the first trimester.
  • Your breasts may be tender or swollen.
  • You may urinate more often.
  • You may be more tired and have less energy, feel more emotional, have mood swings and cry easily.
  • Bleeding gums, nosebleeds and stuffiness are common during this time.
  • Vitamins will give your body key nutrients and help reduce the risk of low birth weight.
  • You should see your doctor about three times during this trimester.
Your Baby:
  • Your baby’s traits and gender are set when the sperm meets the egg.
  • Your baby will grow from the size of a poppy seed to the size of a medium shrimp.
  • The brain, nerves, heart, lungs and bones are forming.
  • You may hear your baby’s heartbeat as early as 6 weeks.
  • Ears, arms, hands, fingers, legs, feet and toes are formed by the 3rd month.