On this site, we have compiled hundreds of sources on the starting point of a human’s life. There are quotes from major publications, scientific writings, and legal sources that indicate that, as a matter of fact, human zygotes, embryos, and fetuses are biological humans.

You will also find sources from members of the ‘pro-life’ and ‘pro-choice’ movements that show people on both sides of the abortion debate recognize that a human’s life begins at fertilization. People agree because it has been the prevailing scientific view on the ontogenetic starting point of a human’s life since German scientist Karl Ernst von Baer first proposed the four laws of animal development in 1828.

Sources can be found under the “SOURCES ON WHEN LIFE BEGINS” dropdown menu at the top of this page, but here is the report that contains all of the sources, as well as the quotes and citations, that are on this site: