I highly doubt any restaurant would do that, best bet on insurance. Anything can happen to the person while doing the dishes.
If you don’t have the money to pay for a meal that you have eaten, one of three things will happen: The restaurant will ask you to leave something that you’ll return for when you have retrieved the funds to pay them. Depending upon the mood of the owner, the amount of the bill and the reasons that you have forgotten your method of payment, they may simply say forget it and comp you your meal. This will rarely happen and no one should expect this to occur when they dine out. They’ll call the police and have you cited or arrested for fraud. Defrauding an innkeeper is a serious offense in a number of states, so you may find that your meal costs you far more than had you simply paid for it in the first place. If you find yourself in a situation where you don’t have the money or another means to pay your tab, call a friend or a family member and have them come and bring you some money to do so.

Make sure you give him access to and read him plenty of books in his childhood and that he gets special education provided to him at school, if he still shows impediment later. I wouldn’t worry too much. I have personally known friends who were speech-impeded, but live fantastic lives nonetheless. One of them had to go to the special speaking teacher at school, and later on the special reading teacher when he was a child, but ended up becoming an Army helicopter pilot and is having the time of his life.
In this day and age, I feel that social development is much more important. As long as your son is confident and gets along with other people well, a bit of speech impediment during childhood should be no problem in today’s society.