MY 4 WEEK OLD BABY I THINK HE HAS FLEM IN HIS LUNGS I HEAR A NOICE WHEN HE BREATHS, HE IS SLEEPING NORMALLY AT THIS MOMENT, DURING THE DAY HE HAS BEEN VERY UNCONFOTABLE, HIS DR. TOLD ME THAT HE MUGHT HAVE ACID REFLUX, BUT ALSO SAID THAT THE SYMPTOMS OF A COLD ARE THE SAME AS THE ACID REFLUX, THAT I HAVE TO WATCH IF HE HAS A STUFFY NOSE. WHAT SHOULD I DO?