about worm in children and adult

I see that you live in Australia. I would be EXCEEDINGLY surprised if cases of worms were anything other than highly unusual. Children certainly DO NOT usually have worms (in developed countries, at least). Worms are of various types and can get into the body through drinking contaminated water, eating undercooked and improperly kept meat and through skin contact, usually preventable by good hygiene. There is a list of common parasitic worms and their symptoms here: http://www.fatfreekitchen.com/home-remedy/worms.html If you suspect that your child has worms, you should take him to a doctor, who will prescribe the proper medicine for a two-year old. DO NOT try to treat him yourself: many home remedies can be highly dangerous for adults, let alone children.