Vaccine injury or from the enormous amounts of pain killer they give women during labor. If it's enough to make it so they can't feel giving birth then it's gonna effect the baby too (and does 100%).
Yeah 90% of SIDS are a mix of vaccine deaths, murders and neglect cases. *Maybe* 5% are sporadic electrical heart problems or breathing problems (some near misses are caught when babies stats are monitored) and then probably only 5% or less are actual sudden unexplainable deaths.