How many cm will a baby be when she is born?

There are no certain answers to your question, unfortunately. Babies, regardless of gender, come in all varying heights and weights.

You should expect that she be between 18-22 (46-52 cm) inches in length depending upon the week of birth. At 40 weeks, which is full gestation, a baby should be about 20 inches or approximately 51 centimeters.