The Guinness Book of Records also says that the most babies in one birth was (a) ten (the most according to reliable reports) (b) nine (the most in a case medically recorded) (c) the most surviving were 7 out of 8, and a couple of cases of 7 out of 7. The woman who was pregnant with 15 foetuses had them removed surgically, and would almost certainly have suffered a miscarriage anyway otherwise. AFAIK, there have never been any surviving babies out of pregnancies of more than 8.