I have 4, but I agree it feels too much at times, but that’s likely due to the additional needs two of ours have. If they were all neurotypical I’d happily have two more - that would be my total limit, and we’d only do that because we started very young, and if we waited 5 years to have 2 more our eldest two will be adults.
Clothes, food, cleaning etc are fine. Juggling clubs can be a challenge but doable, easier now the older two are able to stay home alone for an hour or so.
No children are ever responsible for others in our family and they never will be, it’s something I thoroughly disagree with.