Your child's health and safety is our top priority. Please search our resource library for information on health, nutrition, fitness, injury prevention and other important topics.
Week 1 is actually your menstrual period, but because your due date is calculated from the first day of your last period, it counts as part of your 40-week pregnancy.
At this point in the pregnancy, all vital organs have been formed and are starting to work together. Congenital abnormalities are unlikely to develop after week 10.
As you begin the second trimester, your baby may be able to put a thumb in his or her mouth although the sucking muscles aren't completely developed yet.
Some fine hairs, called lanugo, have developed on your baby's face. This soft colorless hair protects the skin and will eventually cover most of your baby's body until it is shed just before delivery.
