I was going apple picking the other day with my 3 children ka"h. A random guy comes over to me, "aren't your kids too close in age?".
I told him that the oldest is short and he's 6, and the youngest is 1. He was satisfied.
I wasn't interested in getting into a philosophical argument with him, if the reason why people stopped having kids so close in age (and only 2-3 kids), is out of concern for their children, or selfishness.......