If you want to have a baby girl, there are some things you can do to increase your chances. Without a doctors help, you can time your intercourse correctly. The theory is that female sperm are slower swimmers and live longer than male sperm. This means you’d want to have intercourse about 3 to 4 days before ovulation and then not again until after. There are methods that doctors can do to help select the gender of your baby. Please discuss these with your OB/GYN.