sudden infant death syndrome
US /ˌsʌd.ən ˌɪn.fənt ˈdeθ ˌsɪn.droʊm/
UK /ˌsʌd.ən ˌɪn.fənt ˈdeθ ˌsɪn.droʊm/

1.
the unexplained death, usually during sleep, of a seemingly healthy baby less than a year old
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Parents are advised to place infants on their backs to sleep to reduce the risk of sudden infant death syndrome.
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Research continues into the causes and prevention of sudden infant death syndrome.