From the World Federation of Societies of Anesthesiologists' Update in Anesthesia Volume 31 (2016) (My pace of reading's too slow):
Last time in Melaka I was militant about keeping mothers warm during Caesarean sections; it was a failure if they shivered. I'd both force-air warm them and put fluid warmers. I'd rather they complain they complain that it's too warm (after the abdomen is open) that have them shiver. It's good that there is a rational to be more vigilant about the mothers' temperatures in the OR.