Because that's when the vital organs are shaped, heart, brain etc.
the organs grow larger
3rd trimester
Fingers and toes develop during the first trimester of pregnancy in a human fetus.
blood flow from the mother to the fetus
the first trimester
in the first trimester
It grows in size
At the third trimester.
they are passed to the fetus and cause imbalanced compounds that effect DNA
in the first trimester/3 MONTHS
The central nervous system develops in a fetus during the first trimester of pregnancy.
Three Months.