PRENATAL CHANGES (BABY) First trimester Month 1
Fertilized egg reaches the uterus and attaches itself to the uterus.
Cell multiplication begins
Internal organs and circulatory system begins to form
Cell division takes palace and at the end of 2 weeks the zygote is the size of a pin-head
Heart begins to beat
Small bumps show the beginnings of arms and legs
Month 2
A 5 weeks the embryo is about 1 1/8 inch long
All major organ systems develop The placenta and umbilical cord develop
Amniotic fluid surrounds the baby
Face and limbs take shape
Month 3
Baby is 2-1/2 to 3 inches long.
Weight is about 1/2 to 1 ounce.
Baby develops recognizable form.
Nails start to develop and earlobes are formed.
Arms, hands, fingers, legs, feet and toes are fully formed, Eyes are almost fully developed. Baby has developed most organs and tissues. Baby's heart rate can be heard at 10 weeks with a special instrument called a Doppler.
At 10 weeks the developing baby is considered to be fetus. ​