Predisposing host and epidemiological risk factors associated with SIDS
| Prenatal/pregnancy 5– 8 |
| Higher parity |
| Low birth weight, short gestation (intrauterine growth retardation) |
| Inadequate prenatal care |
| Maternal smoking |
| Smoking within the household during pregnancy |
| Maternal recreational drug use (opiates, cocaine) |
| Urinary tract infection9 |
| Demographic/genetic 8 |
| Lower socioeconomic status |
| Race-ethnicity: African-American, indigenous populations: Aboriginal Australian, Maori, Native Americans |
| Age at death (peak at 2–4 months) |
| Male gender |
| Cold season |
| IL-10 low producer |
| IL-1b high producers |
| Neonatal/postnatal 5– 6, 8, 10– 12 |
| Infections (URTI or gastroenteritis)(recent illness potentiates effect of prone sleep position and overwrapping) |
| Passive exposure to cigarette smoke |
| Lack of breast feeding |
| Prone sleep position |
| Bed sharing |
| Sofa sleeping |
| Used mattress |
| Lack of or late immunisation |