We never used the crying rooms - except in a rare instance where we had to remove a child for a few minutes. We have four children in five years. (Although now, they are 13 to 9, I well remember those early years).
We decided from the beginning to move right up to one of the front pews. (so the kids weren’t just seeing the backs of people) We tried our best to control the young children. We have been thanked by many people over the years for bringing our very young children to mass. From afar, our children were generally well behaved - (although I had to admit to some that they would not have been quite as complimentary if they had sat right behind us.) .
Our kids were not saints by any means. We tried very hard to not disturb others. For each of our kids there was always one mass where I had to take the kids out of the mass and sit on one of entry steps and tell the child that we were going to sit right here until they learn to behave. Eventually, after sitting in silence for a five to ten minutes, the child would beg to be able to go back into church.
before we had kids, and In the early days of our kids, I had volunteered to work in a special program that was bringing sacraments to kids with special needs (autism, downs, etc.). That program was intended to celebrate everyone - and not hide people with differences. Most of that program was outside of church, but then we had a few masses where we celebrated all of our special needs kids. The congregation was always in awe and welcoming of the whole program - and we didn’t sit together as a group, but rather, sat spread throughout the congregation - as an integral part of that congregation.
I learned a lot from that program - and applied some of the methods we learned on my own young children… I do have to admit, that I usually didn’t get to pay close attention to mass itself, as I was always looking out for young children - but the kids learned early on how to behave - and it has paid off, not only in mass - but for other occasions where we expected them to be still for an hour (weddings, movies, etc.)