Nature Climate Change, Published online: 02 December 2019; doi:10.1038/s41558-019-0632-4
Hot weather can cause early childbirth, meaning shorter gestation. Daily US birth-rate data from 1969 to 1988 show that deliveries increased on hot days and that those births occurred up to two weeks early. Around 25,000 infants were born early each year, representing over 150,000 gestational days lost annually.
