Traveling with a baby doesn’t have to be intimidating—especially when you plan ahead. For our second cross-country trip to California, my son was just six months old, and we made the most of it by learning the ins and outs of flying with an infant. Here’s how it went and what I learned along the way. After doing a ton of research, I found that most U.S. airlines allow children under two to fly free as a lap infant (no separate seat required). That saved us a chunk of change, and luckily our flight wasn’t full, so they let me bring his FAA-approved car seat on board anyway. (Tip: Look…