Fever vomiting diarrhea cough with mucus runny nose lack of energy and loss of weight these are the symptoms t?

fever vomiting diarrhea cough with mucus runny nose lack of energy and loss of weight these are the symptoms that my 7 month old baby has also the cough when it comes it hard for him and then he tries to vomit but it seems to be really hard for him he turns really red and gags really hard and you can hear the vomit coming up and down his throat and his little chest has some sort of sound in it like if the mucus was stuck on his lungs