A.W.
I flew when my daughter was 10 months old and nursed going up and coming down and it worked wonderful. You can take the stroller to the airplane door and then they will gate check it and you will get it back right after you step off the plane. No need waiting for the luggage to come around. For liquids you can take them. As long as they are for the children. I took juice boxes when I flew with my 3 year old about a month ago. Just declare them at security and they won't question you. They might question you if you have large quantities but I had no problem and I had 3 boxes of juice for a 3 hour flight.