My 2 year 10 month old son is vomiting with no fever and bouts of diarrhoea. he vomited in the morning and the milk was curdled and now in the evening after going to bed?

Many possibilities: A toddler who is throwing up and having diarrhea can see his primary care doctor, who can evaluate and offer advise and medication as needed. Common causes of such symptoms are the stomach flu, food poisoning, ear infection, influenza, toxin ingestion, or other infections. Many times, we don't know the exact cause even after an exam, but just help with symptom relief. His doctor can help.