A little bit of stress is normal. But too much, and at a vulnerable time, can lead to long-lasting problems that cut across generations. A new study from the University of Colorado Denver has found the stress that comes with racial discrimination during a woman’s pregnancy may get passed on to her newborn child. A solid amount of evidence already exists to support stress as not just a temporary frustration, but as a force capable of changing our genes — particularly if the stress is chronic. Severely stressed-out teenagers, for example, face a greater risk of mental illness in adulthood because of how the stress affects their genes. The effect comes from the hormone cortisol. The longer it stays in your body, the more your body begins to adjust to the new normal of constant stress, and it breaks down.