This is commonly scene in cases of sudden infant death syndrome (SIDS). Fluid from the lungs comes up the airway and may exude from the nose and mouth. This should not be considered a suspicious sign of death even if there is a large amount soaked into the bedding. Blood may mix with the air or agonal (at death) breathing to produce the froth or bubbles. The froth may be quite bloody, or white if there is no blood.
This does not mean that all froth, either bloody or not, is a sign of natural disease. Froth may be an indication of a drug overdose, or drowning. Many drug overdoses cause depression of breathing which leads to lung failure and death. Fluid builds up in the lungs and airways.
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