This site is like KidSpiration, but it is free and easy to use. elements story, create-your-own-topic. Source: Liz Phillips. After a teacher types in the story starter, students log in to write. read, the class decides which direction the story should take. class agrees the story is finished.
Fetal development - month 1. First trimester. At the end of four weeks: Baby is 1/4 inch long. Heart, digestive system, backbone and spinal cord begin to form. Placenta (sometimes called afterbirth) begins to develop. The single fertilized egg is now 10,000 times larger than it was at conception.
As you approach the second trimester in Week 13, the fetus is just under an ounce, and the uterus is about size of a grapefruit. In Week 28, the baby is under 3 pounds, but the following 10 weeks will see them roughly double in size. The uterus, in turn, suddenly expands to accommodate the rapid fetal growth towards the end of pregnancy.