PDF) Ultrasonographic observation of a female fetus' sexual behavior in utero Masturbation: Why it happens and what to do about it BabyCenter Fetal Swallowing and Mouth Movements: Key Points, 1. Early Development (Weeks 4 8):, The mouth and jaw structures begin forming., Tongue, palate, and necessary swallowing structures Female Masturbation Doesn't Cause Infertility: 10 Things to Consider Does Masturbation Reduce Sperm Count & Cause Fertility? Did you know that male fetuses may be more vulnerable to stress during pregnancy? This is often described as the Fragile Male Hypothesis, which suggests that male fetuses may be biologically more