Exposure to a combination of excess stress hormones and chemicals while in the womb could affect a man's fertility in later life, a study suggests.
Researchers looked at the effect of stress hormones – glucocorticoids – combined with a common chemical used in glues, paints and plastics. They found that the combination strikingly increased the likelihood of reproductive birth defects.
These include cryptorchidism, when the testes fail to drop, and hypospadias, when the urinary tract is wrongly aligned. The conditions are the most common birth defects in male babies.