With a SIDs death, there is no blood or trauma at the mouth and nose area. SIDs babies are babies who stop breathing during the night for an unknown reason. Because researchers and doctors cannot find a cause, they call the death a sudden infant death syndrome case.
I feel sure that the police and paramedics will research this case and will decide whether or not to persue this matter further. Any bay that dies from SIDs must undergo an autopsy.
Let's both pray that your friend did not harm the baby.
Let me know if you still have questions.
