Being a twin

Under natural conditions, your chance of having a pregnancy with more than one baby is relatively low (approximately a 1.5% chance). However, the number of multiple births has increased dramatically over the past 15 years. There are two specific reasons contributing to this increase. The first one is the use of fertility drugs and in-vitro fertilization. The second is the increase of pregnancies in older moms, who have an increased likelihood of multiple birth pregnancy.