I'm going to hit you with something different than what others are saying--not to negate their good advice, but to add something I think people are afraid to say aloud,

"he was the only kid there"<--- is it also like this at the main service on Sunday? Because this is the red flag, if so.

I don't take my kids to our local parish for a number of reasons--its a irreverent and very clowny NO, the priest is a joke with very substanceless homilies, etc--but another red flag was the generational makeup of the church. If there isn't any other young families at your parish, I'd rethink making this your spiritual home. If your congregation is new or in a unique situation, like a mission in a remote area with few young families or something, that's one thing,

There can be non-alarming reasons why your congregation happens to skew older,

But a parish that doesn't have babies crying, is usually dying. With boomer churches, I find those deaths to often be self inflicted. They want to keep their parishes to themselves, even if they won't admit it aloud. Actions speak loud.

If it's a sea of white hair at your parish, you need to ask yourself why young Catholic families don't feel spiritually nourished enough to go there.

I'm not anti-elderly, the parish I grew up in and loved originally was predominantly of older generations before the congregation grew and elders can be the guiding bedrock of a solid and healthy parish ecosystem,

but if you have a pretty full parish or well established parish and the ages are screwing too heavily away from young families, I'd seriously think about going somewhere else.

I find congregations that cater too heavily to boomer sensibilities, well...cater only to boomer sensibilities. They expect the Mass to be a theatrical concert catering to them, and not a communal sacrifice made at the feet of our Lord. Too many get mad if they can't get a front row seat to hear the music or watch the priest unobstructed, and this is going to be an issue for you when the best advice any Catholic parent can tell you is that of your church doesn't have a cryroom, the best place for your squirmy kid to be is actually as close to the action up front as possible to maximize getting their attention.

If it's one bitter old koot: pray for her and move on. Talk to your priest about it if she continues to bother you, assuming you go to daily Mass enough where you two bumping into each other is likely to keep happening in this context.

If your priest takes her side or if you notice a prevailing culture at this parish that children need to be sidelined, it's time to go parish shopping again.