From the moment of conception to the time of delivery, your growing baby goes through several stages of development. The first third of your pregnancy is called the first trimester. It’s made up of weeks 1 through 12 or 13 of pregnancy. Here is a summary of how your baby develops during the first trimester. Show
Path to improved healthPregnancy begins when a man’s sperm fertilizes a woman’s egg. Since you don’t always know when fertilization occurred, doctors calculate pregnancy based on the first day of your last menstrual period (LMP). Your doctor will count forward 40 weeks from your LMP to estimate the due date. Most births occur between weeks 38 and 42. If you have an ultrasound early in your pregnancy, your doctor may measure the baby to determine your due date instead. After conception, your baby begins a period of dramatic change known as the embryonic stage. This stage runs from the 5th through the 10th week of pregnancy. During this stage, the baby is called an embryo. There are numerous changes that occur during the embryonic stage. First, the cells of the embryo (called embryonic stem cells) multiply and develop. They become the hundreds of different types of cells needed to make a whole human body. Your baby’s major organs and body parts begin to take shape. The placenta forms during the embryonic stage. The placenta takes nutrients, oxygen, and water from your blood and passes these along to your baby through the umbilical cord. It also removes the baby’s wastes. The placenta will filter out most of the harmful substances that may be present in your body. The amniotic sac forms during this stage as well. It is filled with amniotic fluid, which surrounds and protects your baby in the uterus. Below are some of the highlights that occur during the embryonic stage.
By the end of the embryonic stage at week 10 of your pregnancy, your baby will be about 1 inch long. That’s still too small for you to feel your baby’s movements. You’ll probably feel them starting in the middle of the second trimester. After the embryonic stage, the fetal stage begins and your baby is called a fetus. This stage runs from the 11th week until birth. Your baby will grow longer and gain weight quicker. His or her organs and body parts will continue to develop. Fingernails and toenails begin to form and the kidneys start working. By the end of the first trimester, your baby has tripled in length to about 3 inches long. Things to considerAs your baby develops in the womb, your body goes through a lot of changes as well. Make an appointment with your doctor if you think or know you’re pregnant. He or she will be able to confirm your pregnancy. Your doctor will also talk with you about your baby’s development and prenatal care. So much important development happens during the first trimester. It is important to not take any medicines without first asking the advice of your doctor. Questions for your doctor
ResourcesAmerican Academy of Family Physicians: Changes in Your Body During Pregnancy: First Trimester March of Dimes: Pregnancy Week by Week National Institutes of Health, MedlinePlus: Fetal Development Copyright © American Academy of Family Physicians This information provides a general overview and may not apply to everyone. Talk to your family doctor to find out if this information applies to you and to get more information on this subject. Is the process of organ formation during the first two months of prenatal?During the embryonic stage, the heart begins to beat and organs form and begin to function. At 22 days after conception, the neural tube forms along the back of the embryo, developing into the spinal cord and brain.
What is the first organ to form in prenatal development when does this occur?Just four weeks after conception, the neural tube along your baby's back is closing. The baby's brain and spinal cord will develop from the neural tube. The heart and other organs also are starting to form. Structures necessary to the formation of the eyes and ears develop.
What is the first 2 weeks of prenatal development called?The process of prenatal development occurs in three main stages. The first two weeks after conception are known as the germinal stage, the third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.
What develops in month 2 of pregnancy?Month 2 (weeks 5 through 8)
Tiny buds that eventually grow into arms and legs are forming. Fingers, toes and eyes are also forming. The neural tube (brain, spinal cord and other neural tissue of the central nervous system) is well formed now. The digestive tract and sensory organs begin to develop too.
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