Fetal development: What happens during the first trimester?

Fetal development: What happens during the first trimester? Fetal development begins before you even know you're pregnant. Here...

Male infertility

Definition An estimated 10 percent to 15 percent of couples are classified as infertile, which means that they've been trying t...

Low sperm count

Definition Low sperm count (oligospermia) is one cause of male infertility. Although it takes only a single sperm to fertilize an e...