This essentially entails sitting in the car with the dog for increasing periods of time with engine off, then with the engine running, then going on longer and longer drives. (washingtonpost.com)
This should not be ignored, however, during the day you can certainly supervise your baby for increasing periods of time on his belly. (day2dayparenting.com)
Next, teach the dog to be left alone for gradually increasing periods of time. (cspca.com)