How Old Should A Kitten Be Before Getting Fixed?

My kittens are all about a month old, and they’re going to be fixed for the first time when they’re four months old. Should I wait until then or should I do it right now? This is not a matter of money though, as my family is wealthy enough that we have no problem paying for vet bills. It’s just important because my mom always tells me how she wants us to wait till we can afford our own pets before getting them spayed/neutered so that they won’t feel like if their owners don’t take care of them properly, they’ll go feral or something. Anyways, sorry if this question isn’t exactly what you were looking for but it’s been bugging me since i came here!