You should speak with a personal injury attorney: if the restaurant was negligent and you were not also negligent, then you may be able to sue them for the damages--e.g. medical care; possibly pain and suffering--if they are significant enough to justify the cost of a lawsuit.The issue may be whether you are contributorily negligent (also called comparatively negligent) as well. That means that if your own negligence or carelessness contributed to the accident, your ability to recover damages, or the amount you can recover, may be reduced. Depending on the circumstances--was hot corn ordered for the 5 year old, which may be inappropriate; even if the lid might have been loose, where you or your child the one who knocked it over--it may be that your negligence contributed as well.That said, if your child had significant pain, suffering, or medical costs, it would be worth exploring your options with a personal injury attorney. Good luck.