Babycenter is committed to providing the most helpful and trustworthy pregnancy and parenting information in the world our content is doctor approved and evidence based and our community is moderated lively and welcomingwith thousands of award winning articles and community groups you can track your pregnancy and babys growth get answers to your toughest questions and connect with . If youre breaking out get ready for a girl 3 look at your breasts in the mirror if your right breast is larger than your left youre having a girl if your left breast looks larger its a boy 4 consult a chinese gender chart which uses your age and the month you conceived to determine babys sex. What determines the sex of your baby when its time to have a baby some couples are intent on trying various methods such as diet sexual position and timing to try to conceive a boy or girl but are these methods reliable here we explore recent research and some unique methods that some people experiment with in their quest to conceive. Many parents find out their babys sex during their mid pregnancy ultrasound usually done between 16 and 20 weeks however if the ultrasound technicians view is blocked there are a few other ways to determine your babys sex first noninvasive prenatal testing is a blood test that detects tiny amounts of baby dna in the mother. Our chinese gender predictor calculator forecasts your babys sex based on an ancient chinese gender chart and the chinese lunar calendar theres no scientific evidence that the chinese gender predictor works but since there are only two choices boy or girl it has at least a 50 50 chance of making an accurate prediction