<s>[INST] My 3 week old has been having problems with his formula so they changed it to soy. Now he throws up, it comes out of his nose at times & he gets choked a lot. I ve also noticed he seems to be developing a cold, sneezing, coughing, & sucking yellow mucous out of his nose. He also has began to keep bubbly spit around his mouth. Does this all sound like a problem developing or all sound normal? [/INST] Hello... I've reviewed your question... Now regurgitation of feed from mouth and nose two to three times a day is a normal phenomenon provided baby is feeding well, gaining weight and passes adequate urine... sneezing and mucus are mainly due to weather changes and simple normal saline nasal Chat Doctor. . But if baby is not taking feeds well, or she is losing weight, or she is having breathing difficulty than you have to consult pediatrician earliest.... hope my answer will help you... thank you... have a healthy day </s>