How to determine the baby\’s gender when you are seven months pregnant? With the continuous advancement of technology, it is no longer possible to determine the gender of a baby through B-ultrasound as in the early days. If you are seven months pregnant and still don’t know whether your baby is a boy or a girl, don’t worry. Next, we will share several methods to determine the baby’s gender: 1. Ultrasound examination In China, ultrasound examination has become a popular way for parents to confirm the baby’s gender. Mainstream ways of gender. Ultrasound examination is usually performed around 20 weeks of pregnancy and is judged by observing the fetal reproductive organs.