Pregnancy & Baby Index: Pregnancy - Trimester 1: First trimester fetal development
First trimester fetal development
From even before you get that positive pregnancy test, through forcing down those daily prenatal vitamins and past the cravings and nausea, your little baby is blissfully developing. Come see how your baby develops during the first trimester of pregnancy in this slideshow! Take a peek at the incredible changes the embryo and fetus experiences in the first weeks after conception.
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The slides, in sequence:
2 weeks gestational age (4 weeks menstrual age)
Actual size: approximately 1/8 inch
4 weeks gestational age (6 weeks menstrual age)
Actual size: approximately 1/6 inch
5 weeks gestational age (7 weeks menstrual age)
Actual size: approximately 1/3 inch
6 weeks gestational age (8 weeks menstrual age)
Actual size: approximately 1/2 inch
9 weeks gestational age (11 weeks menstrual age)
Actual size: approximately 1 inch
12 weeks gestational age (14 weeks menstrual age)
Actual size: approximately 1-1/2 inches
Please note: These images are NOT to scale. All pictures are enlarged to show approximate developmental detail.