evidence: Scientific evidence shows that vaccine ingredients, including aluminum salts, are safe and don’t cause autism. Numerous studies have shown no association between autism and childhood vaccines. While autism rates have risen over time, this is likely explained, at least in part, by changes to the diagnostic criteria for autism which have led to more people qualifying for a diagnosis. Infant mortality is defined as the death of an infant before its first birthday. Birth defects, sudden infant death syndrome (SIDS), preterm birth and low birth weight, and injuries are common factors that cause infant mortality.