If you're old, like me, you remember "cry rooms." Usually they were off to the side of the chapel, with a large double-paned window allowing the parents of fussy babies to see and hear sacrament meeting while the caterwauling was safely contained. Like nuclear waste.
We don't have those rooms anymore. In one-ward meetinghouses, there might be a classroom with piped-in sound from the chapel, where parents of noisy children can go for refuge, but that doesn't work if another ward is holding classes during your sacrament meeting.