I agree you shouldn't breed tinies or hit your pet.
But also you can't compare a 3 month old human to a 3 month old dog.
3 month old humans can't even crawl yet let alone walk, no one would even consider sitting their 3 month old baby on the potty chair, but you do consider taking your 3 month old pup to the pee pad or outside, so no comparison.
Young pups have small bladders and you have to keep an eye on them closely and take them out many many times a day.
I would never hit my baby, but be ready to make some noise when you see them ready to do their business and take them where they need to be and praise and treat them.
I can't even understand why this thread was started in the first place?