Yes, baby or pregnant girl?
Is the op talking about a baby? It sounds like she's talking about her daughter who is 13 weeks pregnant and having morning sickness?
You need to take him to the doctor right away if it is vomiting or diarreah. Babies dehydrate very quickly and can become very sick very quick. Coughing or respitory difficulty is also serious. I would contact your pediatricians office right now. Dont wait...he is too little... good luck