I just flew with 2 kids and 4 carry ons. We had to go to the service desk to check 2 car seats anyway, so I asked the lady if we could gate check our carry ons while we were there. They did it free of charge. I don’t know if all airlines/ airports will do it, but Delta did. It was super convenient to not have to lug around 4 bags through security and around the airport/ layover airport while chasing 2 kids. Unfortunately, I’m flying United back who only allows a “personal item” so I’m assuming that’s not going to be an option on my return flight.