External sex organs begin to develop as a result of sex hormones, primarily androgens. (Arnold, Caroline. Sex Hormones. p 60-61. NY: William Morrow & Company, 1981.)

Cells are in place to form the cerebral cortex in the core of the fetal brain. (Durden-Smith, Jo, and Diane deSimone. Sex and the Brain. p 168-175. NY: Arbor House Publishing, 1983.)

Taste buds are formed. (Ludington-Hoe, Susan, PhD, with Susan K. Golant, MA. How to Have a Smarter Baby. p 20. NY: Bantam Books, 1985.)