About Your Baby

  • Weeks 5 to 8: Heart begins to beat. Most major organs form, but don’t yet fully function. Arms and legs can be seen on ultrasound, and the eyes, fingers, and toes are forming.
  • Weeks 9 to 12: Arms and legs can bend, and bones and muscles begin to grow. Eyelids and nail beds begin to form. Kidneys begin to produce urine, and hair begins to grow.
  • At the end of this trimester, your baby is about 2 ½ inches long and weighs about ½ ounce.

About You

A new pregnancy can bring a mix of powerful emotions - and a lot of daydreams about what the future holds. It can also bring changes to your body, long before you begin to “look pregnant.” For example, you’ll probably feel very tired. Your breasts may feel tender, and you may find that you need to urinate more often throughout the day. Heartburn and mood swings are also common. And if you are going to have morning sickness during the pregnancy, chances are you’ll have it now, in the first trimester.

Tips for the First Trimester

  • Manage morning sickness by eating five or six small meals - high in protein and complex carbohydrates - throughout the day. Don’t let your stomach get too full or too empty, and avoid fatty foods and any odors that bother you. Rest often.
  • Ask your doctor how much weight you should gain during pregnancy. Every woman is unique, and so is every pregnancy. However, there are averages that help your doctor or midwife gauge how much weight you should gain. For many women, a weight gain of 25 to 35 pounds is fine, though your doctor may recommend that you gain more or less, depending on your situation. Most of the weight gained in pregnancy comes in the second and third trimesters.
  • Signup for the Healthy Beginnings program. This free SelectHealth service promotes a safe and healthy pregnancy. SelectHealth members can receive education and planning materials, access to advice and support from nurses specializing in prenatal care, a new-parent newsletter, and more. If you’re not a SelectHealth member, contact your health insurance provider or your state’s WIC for information on prenatal support programs.