The relationship between the time of morning sickness and the gender of the baby. The manifestations of morning sickness. Morning sickness is a phenomenon that most pregnant women will experience, especially in the early stages of pregnancy, especially when they wake up in the morning or on an empty stomach. Research shows that about 80% of pregnant women will experience morning sickness, and about 30% of them will have severe morning sickness, which is called \”severe morning sickness.\” In addition, symptoms of morning sickness include dizziness,