Hundreds of thousands of couples in the United States experience infertility each year. When initial measures do not help, some couples require a process called ovarian stimulation and in vitro fertilization (IVF). Usually, a woman produces at most one egg each month. Ovarian stimulation helps these women make more than one egg per month. However, this involves taking hormones that stimulate the ovary to produce many eggs at one time. The stimulatory hormones injected with a small needle. The eggs are removed from the ovary through a surgical procedure and then placed in a dish for fertilization by sperm to form embryos. The embryos are grown in the laboratory then replaced into the woman's uterus 3-5 days later.