<s>[INST] Hello my son 16 months old and is on permenent pacemaker as he was born with 3rd degree heart block.right now he is sleeping next to.his chest seems clear and nasal way is all clear too but he is snoring and seems uncomfortable.i have noticed white foam ,quite alot of it coming out of his mouth from the last two days.he is a formula baby and most of the time he is with a problem like flue or cold and his chest gets congested often.his father is asthematic , just for the info [/INST] Hello  dear,Welcome to HCM. With his snoring he should sleep on the left side. It should help the snoring and more oxygen will come in lungs. The foam is probably related to nasal drip, i think child can not swallow nasal mucous .Snoring is unusual for 16 month baby he should have checked by your doctor.  Kind regards  Dr.Svetlana Shrivastva </s>