See the most important things I've learned after flying solo with an infant for the first time. Tips to help you with checking in, getting through security, passing time in airports during layovers, boarding the plane, flying with a toddler in a car seat (after scoring an extra seat), and flying with a toddler on your lap (if they're under age 2 and the flight is full). Here are 16 things I would do differently if I could do it all over again...See the most important things I've learned after flying solo with an infant for the first time. Tips to help you with checking in, getting through security, passing time in airports during layovers, boarding the plane, flying with a toddler in a car seat (after scoring an extra seat), and flying with a toddler on your lap (if they're under age 2 and the flight is full). Here are 16 things I would do differently if I could do it all over again...