How to give birth to a girl through scientific methods. The issue of male-to-female ratio has always been a concern for most families. Especially for couples who want to give birth to a girl, how to choose the gender scientifically is particularly important. Below we will introduce how to scientifically conceive a girl from four aspects: genetics, diet, living habits and medical methods. Genetics From a genetic perspective, the key to having a girl lies in chromosomes. There are 23 pairs of human chromosomes, of which the