Studies have found that women who consumed around 200 milligrams of caffeine daily, which is the equivalent of two cups of regular coffee a day, were twice as likely to suffer from a miscarriage. Experts recommend that during the first trimester of pregnancy caffeine should be banned from a woman’s diet, and during the later months the intake should be limited to around a single cup of regular coffee per day.

At four months, a baby’s leg muscles are beginning to form. When his or her feet connect with the ground, and their bodies are being supported, a four month old should push back against the floor, straightening his or her legs out.

For older women aged 35, infertility may come into question after 6 months

Studies show that obese men are less fertile than men of normal weight, have lower sperm counts and fewer sperm that can swim well.

Even in your prime, about half of all eggs have chromosomal abnormalities, and the proportion of eggs with genetic problems increases as you age, explains Dr. David Adamson, president of the American Society for Reproductive Medicine.

Only barrier methods (male condoms and internal condoms) prevent pregnancy and STIs. The rest only protect against pregnancy but not from infections.