My three month baby he chest cold since a month now it rattles on his chest when he breaths can u tell me what to do also he spits up when he burps i?

See a physician: Hello. I would recommend that your baby be seen by a medical provider to make sure that the "cold" hasn't settled into his chest, creating something like pneumonia. Babies don't have the ability to clear their mucus like you and I do, so it's important to have him examined. Also, throwing up can be a sign that it has settled in his chest, too.