Right. It’s the sitting quietly for 60 minutes that is the primary obstacle.
The only Mass I can think of where we sit quietly for 60 minutes would be an Easter Vigil with a very large number of people being received.
Mass happens in bursts of quiet then activity.
First is a song.
Most parishes use the same 15 or so hymns over and over. Learn those songs. Buy them on iTunes or Amazon, put them in a play list and sing them around the house. Teach these songs to your kids (kids learn so much with music).
This way, most of the time, your child is going to know the songs and sing along.
That first part of Mass is standing so the child can wiggle, sing, stand and stretch.
This gets you to the readings. You are only going to have maybe 10 minutes TOPS where you sit and be quiet, then it is time to STAND UP again. There are motions and responses to say!
After the Gospel, you are going to have another 10 minutes of sitting still.
Another time to stand and we get to RESPOND to the prayers!
Another of those familiar hymns to sing along, and we also get to put some money in the offering!!
Then it is time for some quiet time, but, it is broken up with kneeling and responding and singing.
Don’t forget the kid’s favorite, the Sign of Peace!!
About 3 more minutes of stillness until we again sing and get to walk down front with mom/dad.
A couple more minutes of quiet and we sing another song! Do we know this one, or is it one we need to learn this next week?