The first trimester of pregnancy is 13 weeks long. The women 's body go through some serious changes to nurture a new life. The first clear sign that your are pregnant is your period stopping. Many women do not know they are pregnant until the second week of the first trimester, this happens to be because that is when they notice they are not getting their period. The mother experiences a wide range of symptoms as their body go through the change. One well known symptom while being pregnant is the "morning sickness". The "morning …show more content…
In the site, it also says the tail will disappear, fingers and toes will be longer, and umbilical cord will connect to the abdomen of the baby to the placenta, which will get nutrients to the baby and help get rid of waste. By the 12th week, Planned Parenthood says the bones of the baby should start to harden and the baby 's should start making movements by then. Womens Health wrote that by the 12th week, the baby 's nerves and muscles will start working together and the external sex organ will show. It also says that the baby 's eyelids will close to protect the development of their eyes. By then the baby will be about 3 inches long and weigh almost a once. All of this happens on the first trimester of