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    • What does your baby look like now? Follow your baby's development week by week, from conception to labor, in these amazingly detailed, doctor-reviewed images.
    • 2 weeks: Fertilization. At the start of this week, you ovulate. Your egg is fertilized 12 to 24 hours later if a sperm penetrates it – and this simple biological occurrence begins a series of increasingly complicated processes that leads to a new human life, if all goes well.
    • 3 weeks: Implantation. Now nestled in the nutrient-rich lining of your uterus is a microscopic ball of hundreds of rapidly multiplying cells that will develop into your baby.
    • 4 weeks. Your ball of cells is now officially an embryo. You're now about 4 weeks from the beginning of your last period. It's around this time – when your next period would normally be due – that you might be able to get a positive result on a home pregnancy test.
  1. Thanks to ultrasound and other high-tech tools allowing a peek inside the womb, scientists have discovered a virtual sensory playground in which your baby is living.

    • First Trimester
    • Second Trimester
    • Third Trimester
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    The first trimester will span from conception to 12 weeks. This is generally the first three months of pregnancy. During this trimester, the fertilized egg will change from a small grouping of cells to a fetus that begins to have human features. The first trimester is exciting, but also when most people develop unpleasant symptoms like morning sick...

    The second trimester of pregnancy is often thought of as the best part of the experience. By this time, any morning sickness is probably gone and the discomfort of early pregnancy has faded. You may also start to feel movement as the fetus flips and turns in your uterus. During this trimester, many people find out about the fetus’s assigned sex. Th...

    This is the final part of your pregnancy. You may be tempted to start counting down the days to your due dateand hope that it comes early, but each week of this final stage of development helps the fetus prepare for birth. Throughout the third trimester, the fetus gains weight quickly, adding body fat that’ll help after birth. Your healthcare provi...

    Learn how a fertilized egg becomes a fetus and grows in your uterus over 40 weeks. Find out what happens in each trimester and week of pregnancy, from conception to birth.

  2. Jun 3, 2022 · Week 33: Baby detects light. Fetal development 31 weeks after conception. Thirty-three weeks into your pregnancy, or 31 weeks after conception, your baby's pupils can change size in response to a stimulus caused by light. His or her bones are hardening. However, the skull remains soft and flexible.

  3. Looking for a week-by-week guide to pregnancy? You're in luck! We've got loads of expert-approved info about each week and trimester, including what's up with your growing baby and what changes to expect for yourself.

  4. Jun 3, 2022 · What does your baby look like? How big is he or she? When will you feel the first kick? Fetal development typically follows a predictable course. Find out what happens during the first trimester by checking out this weekly calendar of events. Keep in mind that measurements are approximate. Weeks 1 and 2: Getting ready.

  5. Take a peek inside the womb to see how your belly and your baby develop from week to week with this interactive visual pregnancy timeline from WebMD.

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