Anyone know how to get our insurance to pay for potential complications?

Hi, we are adoptive parents planning to adopt a baby girl due next month (9/20). the bmom lives in missouri and has health insurance under her mom’s coverage. we live in ca. By Missouri law, the child of the dependent does not get automatic coverage, so we would have to foot the bill for our baby;s birth and hospital stay. Because we are covered under Kaiser Permanente, and bmom is not giving birth at a KP facility, our insurance will not cover the baby’s expenses. Does anyone have any suggestions or knowledge about this type of situation? We are happy to cover for a well-baby’s normal stay, but if there are any complications, it can be tens or thousands of dollars. Any prior knowledge or suggestions would be greatly appreciated!