no all the organs are not completely formed until week 13.
The formation of a human embryo is complete by the end of the eighth week of pregnancy. At this stage, all major organs and systems have formed, and the embryo is then referred to as a fetus.
When all body organs are present, the developing baby is called a fetus. This stage typically begins around the 9th week of pregnancy and continues until birth.
The human embryo come to be called a fetus by the end of the 9th week of development because all the groundwork has been completed by the 8th week. A&P II student of Judith Miller South University, Montgomery, AL
By around week 8 of pregnancy, all major body systems of the fetus are present. However, they continue to develop and mature throughout the remainder of the pregnancy.
At 6 weeks post-conception, the fetus looks like a little blob - the spinal column has started to stand out and you might make out the eye sockets starting to fold back in. Otherwise, it looks like any vertebrate fetus and is not visually identifiable as human.
Slows the development of all vital organs especially the brain.
It may not have any complications. Organs on the 'wrong' side are quite common. It may even move to its normal position by the end of pregnancy.
All the organs of the fetus develope in first three months of missed period.
A baby's weight can sometimes be low because of the age of the mother. All babies grow at different intervals. Most babies will grow the most during the fifth month.
The major organ systems develop during the embryonic period, which is roughly during weeks 3 to 8 of pregnancy. This is when the foundation for organs such as the heart, lungs, brain, and limbs is established. The specific timing of development for each organ system may vary slightly.
Once the zygote becomes an embryo it starts developing all of its organs, nervous system etc. then after 8 weeks of development everything is there so it becomes a fetus, and the fetus just grows bigger.
1st trimester- all of the baby's body structures and systems develop 2nd trimester- marked by the grown and masturbation of the fetus's organs and body systems. 3rd trimester- the fetal systems continue to grow and mature also the time of the greatest weight gain