Pregnancy: Weekly Guide

Week 1-4
Weeks 1 and 2 If successful, fertilization occurs in the fallopian tube and by the end of the first week cell division and differentiation have occurred, and the blastocyst (the differentiated and spe ...
Week 5-8
Week 5 The baby: the baby is approximately 0. 05 inches long. The foundation of what will later become the heart, the central nervous system (brain and spinal cord), and the muscle and bone formation ...
Week 9-12
Week 9 The baby: the baby is now 0. 9 - 1. 2 inches long. The fingers of the baby are now longer and finger tips are developing. The neck develops and strengthens which allows the baby's head to becom ...
Week 13-16
Week 13 The baby: the baby is now approximately 2. 6 to 3. 1 inches long and weighs 0. 5 - 0. 7 ounces. Between now and the 24th week fetal growth is rapid. The head, which has been larger in proporti ...
Week 17-20
Week 17 The baby: the baby is now 4. 4 - 4. 8 inches long and weighs approximately 3. 5 ounces. Adipose tissue, or fat deposits, begins to grow on him. This tissue serves to help the baby in heat prod ...
Week 21-24
Week 21 The baby: the baby is now approximately 7. 2 inches long and weighs nearly 10. 5 ounces. The baby's organ systems are maturing as the fetal growth rate continues to slow. Simple functioning of ...
Week 25-28
Week 25 The baby: the baby is now approximately 8. 8 inches long and 1. 5 pounds. The heart beat is now audible through a stethoscope or by placing an ear to the mother's stomach. The baby's skin is n ...
Week 29-32
Week 29 The baby: the baby now weighs approximately 2. 7 pounds and is 10. 4 inches long CTR and 16. 7 inches in total. At this point space in the womb becomes very restricted and movements slow down. ...
Week 33-36
Week 33 The baby: the baby now weighs approximately 4. 4 pounds and has grown to nearly 12 inches in CTR length. His total length is near 19. 4 inches. The last few weeks of the baby's life have been ...
Week 37-40
Week 37 The baby: the baby now weighs nearly 6. 5 pounds. He measures 14 inches in CTR length and 21 inches in total length. He is still gaining weight and growing. By now it is likely that the baby's ...