Risk factors for Sudden Infant Death Syndrome (SIDS) include several physical, sleep-related, and maternal factors. Common risk factors are:

• Boys have a slightly higher risk than girls.
• Infants aged 2 to 4 months are at higher risk.
• Race/ethnicity: Higher risk in Black, Native American, and Alaska Native infants.
• Family history of SIDS.
• Exposure to secondhand smoke.
• Premature birth and low birth weight.
• Sleeping on the stomach or side instead of the back.
• Sleeping on a soft surface.
• Bed-sharing with parents, siblings, or pets.
• Overheating during sleep.
• Maternal factors such as young maternal age (<20 years), smoking, drug or alcohol use during pregnancy, and inadequate prenatal care.

Based on this information, any option that does not align with these known risk factors would not be a risk factor for SIDS. If there is a list of specific options, please provide them so the one that is not a risk factor can be identified precisely. Otherwise, any factor outside the above list is likely not a SIDS risk factor.