Showing how the process of IVF came to be is at the center of Netflixs Joy, and from that its evident how the babies eventually delivered had never been conceived in test tubes, however, that was the name that sticked. Throughout the biographical drama, Bob and Jean are often mesmerized by the progress achieved during the fertilization of the egg outside the womb, especially seeing the cells form. The development of the IVF process is the focus of Joy, and the drama has a factual approach that greatly clashes with the sensationalist attitude of the press as shown in Joy.

https://screenrant.com/joy-test-tube-baby-name-inaccurate-explained/