A typical pregnancy lasts 40 weeks from the first day of your last menstrual period (LMP) to the birth of the baby. It is divided into three stages, called trimesters: first trimester, second trimester, and third trimester.
Your baby is about 4 to 5 inches long and weighs almost 3 ounces. At about 20 weeks in the second trimester, your baby continues to develop: Your baby is more active. You might feel movement or kicking. Your baby is covered by fine, feathery hair called lanugo and a waxy protective coating called vernix.
Baby is now like a jiggly jelly bean, but the belly still doesn’t show a bump. So far, there are not many physical changes visible to others. However, your baby is growing and at week 10, and measures about an inch-and-a-half, and is probably the size of a prune.