Week 3. Baby: Congratulations!If your egg and your partner's sperm have joined successfully, your embryo is really there, although it's very small -- about the size of the head of a pin.

With each week of pregnancy, your baby-to-be is developing in leaps and bounds. In the early stages, they are called a zygote. They then progress to an embryo, fetus, and finally, baby. You might ...

Human-embryo models were created by Weatherbee et al. 3 (a), Pedroza et al. 2 (b) and Oldak et al. 1 (c) from naive human stem cells, which, under the correct conditions, self-organize to form ...

For women using IVF/intracytoplasmic sperm injection, SARS-CoV-2 infection within 10 weeks after embryo transfer may not negatively affect pregnancy, implantation and miscarriage rates ...

Four teams have coaxed human stem cells to organize themselves into embryo-like forms. The advance could shed light on fertility. By Carl Zimmer In its first week, a fertilized human egg develops ...