According to Baby Zone, a parent can get an accurate estimate of how tall a baby boy is going to be by adding 5 inches to the mother's height, adding that number to the height of the father and then dividing by two.

To determine how tall a girl is going to be, the father's height is subtracted by five, the mother's height is added and then the total is divided by two. This is due to the fact that girls are generally shorter than boys. However, a baby's genetic makeup is likely to be the main factor when it comes to how tall the baby is going to grow.