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Take into account what you CAN do. You will need a lot of breaks with a baby. Make your plan around that.
Consider TSA Precheck to streamline the process inside of the airport.
Check your airline's policy for lap infants. I suggest car seats for all kids!
Pack ahead of time so that you have time to figure out what you are missing. You are bound to forget something!
Pack your carry-on strategically. Make sure it is put together in a usable fashion. Don't put the most needed products on the bottom.
Do not forget a few changes of clothes. You will likely need them all but hopefully not!