TSA hates terrorists and families with children. I have been through airport security with one or two little little children several times now, and it has never been a pleasant experience. I always travel with my laptop, too, so I use, like, 47 of those little bins -- shoes in one, laptop in another, purse in another, quart sized back of 3 oz or less liquids in another, etc. etc.
And with the children there is the additional cups or bottles of milk, the Maisy books, the baby doll, the blankie that goes everywhere with us. Also, you've got to take off the baby and toddler shoes too, and put them in a bin. And NONE of these objects can be lost or left behind. Keeping track of the inventory at all times is exhausting.
Also, TSA generally won't allow you to reassemble your stuff by putting it back into the bags at the end of the conveyor belt. Instead you are expected to gather it all into your arms, along with your baby and toddler, and go find another place to put it all back together so you can walk again.
The TSA agents are not patient with families. One agent yelled at Jack for touching the conveyor belt. Another yelled at David to get out of the way because David was trying to put something back in a bag so he could pick up Jack and take him somewhere to put his shoes back on him.
But one thing TSA has done right is this site that offers tips about navigating the TSA security process with children.
This particular tip worked great for us during our last trip: "Tell your children that their bags (backpack, dolls, etc.) will be put in the X-ray machine and will come out at the other end and be returned to them."
Before we got up to security I got down to Jack's level, looked him in the eye and explained the process to him, making sure to tell him that he would GET ALL HIS STUFF BACK AGAIN AT THE END. This was very effective.
However, I forgot the next tip: "Let your children know that a Security Officer may ask to see their shoes, but that they will get these back as well."
This freaked Jack out. If you are traveling with a small child, make sure to mention the shoe thing to him or her. It could save many tears.
Better yet, drive.