SIDS, or Sudden Infant Death Syndrome, is the death of healthy child usually during their sleep. After many in-depth studies and death scene investigations, it is still unknown as to why such things happen. About 6,500 children die of SIDS every year in the US. Some major risk factors are maternal smoking, low birth weight, young mother, or poor prenatal care. Most children effected by this are around four months old. It is often recommended to place the baby on their back to reduce the risk of SIDS.