Except that is not the truth as indicated in my experience of it not being mentioned in the several jobs I have had where I worked remote. I’m sorry that that bursts your bubble but that’s the truth. In fact I have been on conference calls where there has been a child present and nobody gave a shit since the person was also extremely productive. Again, if it is not affecting productivity, it is a non issue and it sounds like your managers need to learn that basic fact and figure out how to measure very basic KPIs.
There are some cases where it is absolutely not going to affect performance at all for most people. If both parents work from home, they have much more flexibility in handing off interacting with their child. Some parents might have difficulty finding full time daycare or affording it. They still have core hours when they can focus but may also need some flexibility. Those two scenarios are not going to result in decreased productivity for most employees because they can shift some of their work to other hours.