A large study of 745 SUDI babies and 2411 healthy comparisons found:
62% of deaths were due to:
Turning from side to tummy (12% vs 2%; risk ↑ by 45)
Being placed on the tummy (39% vs 11%; risk ↑ by 13)
Getting a covered head (25% vs 3%; risk ↑ by 12)
NB: Blue numbers relate to 745 and green numbers relate to 2411
‘Face-up, face clear’ saves lives.