Drag to read about a different week.


    Your baby’s heart begins to beat, and vital organs begin to form.

    Embryo begins to take shape in the fifth week

    Your baby’s development

    Vital organs are taking shape.
    After weeks of rapid cell development, your baby takes on a more distinct form. During the 5th week of pregnancy:

    • Your baby's heart and circulatory system take shape — a bulge indicates where her heart is developing. By the end of the 5th week of pregnancy, her earliest blood vessels form.
    • Around the 5th week of pregnancy, your baby's heart begins to beat and might be visible on an ultrasound.
    • The umbilical cord replaces the yolk sac. The umbilical cord works with the placenta to bring nutrition and oxygen to your baby and remove waste.
    • At 5 weeks, your baby is the length of the tip of a pen, about 1/17th of an inch, and growing rapidly every day.
    A woman sipping from a cup of juice

    Your nutrition and health

    Increase your intake of nutrients and fluids.
    Pregnancy is one of the best times to pump up your nutrition, because the choices you make affect both you and baby.

    During your 5th week of pregnancy:

    • Continue to follow a balanced diet.
    • Remember, balance is not in the individual foods, but in your overall diet. For healthy, balanced food plans, www.ChooseMyPlate.gov has a helpful nutrition section specifically for pregnancy and breastfeeding.
    • Stay hydrated. In addition to water, you can count milk or 100% fruit juices as fluid intake, too.

    Small changes, big differences.

    As you begin your pregnancy journey, there are many nutrients, vitamins, and minerals you should ensure you get every day. Here are some simple tips you can use today to get the nutrition you need for the rest of your pregnancy:

    • Switch from white to whole-grain bread. This simple switch will add more fiber to your diet as well as increase the magnesium and selenium. Additionally, you'll get more vitamins, such as niacin and thiamin. Very simple switch for some very important additions.
    • Get more whole grains. Trade sugary cereals for whole-grain cereals, white rice for brown rice, regular for whole-wheat pasta and white bread for whole-grain bread. Try wild rice or barley in soups, stews, casseroles, and salads. Look for products that list whole grains, such as whole-wheat flour, first in the ingredients list.
    A mother smiling with her doctor in the background

    Things to think about now

    Make the most of your doctor visits.
    Regular prenatal care remains a critical part of monitoring your health and the health of your baby throughout your pregnancy. Now is the time to schedule your first prenatal visit. Most OB/GYN offices will schedule the appointment between your 6th and 10th week of pregnancy.

    • Your first prenatal doctor visit will be one of the most involved. Your doctor will confirm your pregnancy and record your medical history. Your doctor will most likely perform a physical exam and a series of additional routine tests to make sure you and your baby are healthy.
    • Good communication is the key to success with your doctor. If you don't understand something at any doctor visit, be sure to ask for clarification or additional details.
    • Get informed and be equipped. The more informed you are, the more you'll be able to make the best choices throughout your pregnancy.
    • Look beyond the belly. Remember to keep up with other areas of your overall health. Schedule routine dental visits and promptly address other health concerns as they arise.

    What happens next week

    Growth spurt!
    Your baby’s nervous system is developing, organs continue to form, and her heart is beating about 80 times a minute. And lucky you—your morning sickness is in full swing.