I’m on both sides of the fence as a parent of a child with autism and a parish DRE.
My son is 7 and is still mostly non-verbal. Mass can be difficult. Honestly, it was easier when he was younger than it is now. When he was little, I could hold him the whole time and he would mainly be still and quiet. Now, not so much.
We still generally sit up front, but that definitely helps me grow in humility. I’m not sure I have an answer for you on what the best thing to do is. I know, for us, the cry room was always the worst place to be. It’s like he can pick up on the distractedness of others because he would always want to be running all over the place when we sat in the cry room. He tends to do best up front (which is not to say he always does that well these days).
I’m sure he’s distracting to others around me, and that does weigh on me, but I’m certain there is a place for him at Mass. So I will never let my discomfort lead me to stop bringing him to Mass. It’s definitely been teaching me new ways to unite my sufferings to Christ.
We often give him a small amount of silly putty to rub between his fingers. Having something like that makes things easier most of the time.
As to the place for special needs children in Church, there certainly is more that needs to be done, but it’s going to take people like us to do it, whether by giving of our time or raising awareness and finding the resources. Would that every Catholic tithed and every parish had more than enough resources to hire a slew of trained, special ed teachers. And would that vocations to priesthood and religious life were booming such that every parish had a slew of priests and nuns, some of whom are trained in special education. Unfortunately, that’s not where we are at. Most all parish CCD classes are taught by volunteers. And these volunteers usually have day jobs and don’t necessarily have special training when it comes to teaching at all let alone teaching special needs children. We do what we can to accommodate, but that’s not always as much as we’d like.
It’s hard. No denying that. My son is of the age to receive First Communion, but that’s not going to be happening for him this year. I’ve got a degree in Theology and I can’t even tell how much of the faith is really sinking in for my son. God can be a tough concept to wrap our minds around when we are “neuro-typical”. For those with autism, it can be even more difficult.
But we keep praying and keep on moving forward. I know that God loves my son. And I know that he has a place in the Church. I haven’t quite figured out how it all works. It’s a work in progress. I would just encourage you that there are other Catholics out there who are going through the same thing that you are going through.
I had one mother of an autistic girl who is now in her 20s tell my wife and I “The Church needs our kids.” I think she’s right. We are many parts and one Body in Christ as the Church. Special needs people are part of the same body that we all are part of. Raising a special needs child is certainly challenging. But he’s also such a source of joy. When I look at him, I know that God loves me so much to have entrusted my son to me. I see what it means to know joy with no pretense whenever my son smiles at me. And, God definitely knows, having a special needs child is a great way to learn selflessness and weed out selfishness.
Sorry for going on and on.

You caught me at an emotional time.

I will keep you and your family in prayer. Pray for my family, too.