Male and female reproductive systems allow human reproduction. Fertilisation occurs when a sperm and egg join to form an embryo. An embryo develops into an unborn baby in the uterus during pregnancy.

Do you have questions about sex hormones or menstrual cycles? This is a crash-course in human reproductive health through fact and biology-based information on a variety of topics. "Sex 101" will ...

Researchers have captured the very first real-time, three-dimensional images and videos of a human embryo implanting into collagen designed to mimic uterine tissue —a key stage in reproduction. The ...

Only about one out of three conceptions leads to birth. 1 Approximately a third of embryos fail to attach to the uterus, while another third is lost after the embryo implants. “Human reproduction is ...

Researchers have captured the very first real-time, three-dimensional images and videos of a human embryo implanting into synthetic uterine tissue—revealing a key stage in reproduction. The resulting ...

Scientists in Japan say they have succeeded in breeding mice with two fathers, using eggs originating from male cells. While the scientific breakthrough could pave the way for new fertility treatments ...

(Paris, France, Monday, 30 June 2025) A new international study presented today at the 41 st Annual Meeting of the European Society of Human Reproduction and Embryology (ESHRE) reveals that IVF cycles ...