congenital malformations

Zika virus has been around since at least 1947, causing mild symptoms. All of a sudden it went full-beast mode and started producing shrinking heads in babies, and other terrible neurological outcomes. Scientists may have figured out that one little amino acid could responsible for flipping the script.
Obesity not only decreases the likelihood that a woman can become pregnant, but obese women are also at increased risk of complications (such as gestational diabetes and elevated blood pressure with its more-worrisome pre-eclampsia)