HOW DOES MY BABY DEVELOP ? ( WEEKS 1-12 )
1st TRIMESTER
WEEKS 1-4 ( Month 1 )
The first day of your last menstruation is usually referred to as Day 1 of the menstrual cycle . On Day 14 , ovulation occurs , and by Day 20 , a fertilized egg travels through the fallopian tube into the uterus . The embryo attaches to the uterine wall and begins to grow rapidly .
month 1 month 1
WEEKS 5-8 ( Month 2 )
By the eighth week of gestation , the embryo has formed limb buds for the arms and legs . The hands and feet are taking shape as well . The heart is beating at about 150 beats per minute . At this time , the embryo is a half-inch long and weighs one-thirtieth of an ounce .
month 1 month 1
WEEKS 9-12 ( Month month 3)
month 2 month 4 / 5
By this time , all of your baby ’ s organ systems are in place . The genitals are distinguishable but not apparent on the ultrasound . The bones have developed , and the eyelids are completely grown . The baby begins to move by jerks and bending of the arms and legs ; however , these movements are not felt yet . The baby is approximately three inches long and weighs 1.5 ounces .
month 3 month 4 / 5
6 My Prenatal Care Book