Because it can catch another germ or virus
During First trimester the growth of the fetus is most remarkable as compared to other two trimesters because during this period structure and organ systems develop.
<h3>What changes occur in fetus during the first trimester?</h3>
First of all nerves system develops during which formation of brain, spinal cord, and nerves take place.
Secondly an S-shaped tube forms the heart of the baby.So heart is developed during first trimester.
The facial feature of the baby take shape and eyes as well as ears form on the sides of the head.
The arms and legs starts to appear like little buds and sexual organs of the baby also formed during this stage.
Therefore,first trimester is the most remarkable stage of the fetal development.
Learn more about first trimester here:
brainly.com/question/428652
#SPJ4
