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High-resolution images of embryos and fetuses
Follow the Science – Fertilization through 12 weeks
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The Science of Life Before Birth – subtitles in 92 languages
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The Biology of Prenatal Development
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High-resolution images of embryos and fetuses developing in utero
Week 1: Embryo (zygote stage) is the size of the period at the end of the sentence
Week 2: Embryo (blastocyst stage) at this age is the size of the head of a pin.
Week 3: Embryo alive in the uterus 3 weeks following fertilization
Week 4: Embryo alive in the uterus 4 weeks following fertilization
Week 5: Embryo alive in the uterus 5 weeks following fertilization
Week 6: Embryo alive in the uterus 6 weeks following fertilization
Week 7: Embryo alive in the uterus 7 weeks following fertilization
Week 8: Embryo alive in the uterus 8 weeks following fertilization
Week 9: Fetus alive in the uterus 9 weeks following fertilization
Week 10: Fetus alive in the uterus 10 weeks following fertilization
Week 11: Fetus alive in the uterus 11 weeks following fertilization
Week 12: Fetus alive in the uterus 12 weeks following fertilization
Month 4: Fetus alive in the uterus 4 months following fertilization
Month 5: Fetus alive in the uterus 5 months following fertilization
Month 6: Fetus alive in the uterus 6 months following fertilization
Month 7: Fetus alive in the uterus 7 months following fertilization
Month 8: Fetus alive in the uterus 8 months following fertilization
Month 9: Fetus alive in the uterus 9 months following fertilization
