How do heat waves affect pregnant people? In this video, Alex Dainis explains that a recent study has shown a correlation between heat waves and early births. Scientists hypothesize that this is due to the impact of heat stress and dehydration during pregnancy. Tracking instances of early births is important because of the effects that an early delivery date can have on babies’ respiratory, behavioral, and cognitive outcomes. This emphasizes why it’s so important to take extra care when pregnant during hot weather!