Hi Twiggy,
I use Ovol for Gas 180 mg softgels. They are really easy to swallow and work adequately. Oh shoot, I just looked at the dosage on the box and it says not to give to children under 12 years old. Darn! Maybe they make a children's version. I buy them in the pharmacy section of any store (Safeway, Real Canadian Superstore, WalMart, etc.)
Sorry I can't be of more help. Maybe check with the doctor or pharmacist to see if they have a suggestion for a child.