I'm sure that there was lead paint everywhere, when I was growing up; however, there were never any paint chips anywhere and with huge radiators in front of windows, I doubt that any kid who was teething, was about to climb on a hot radiator to chew on a window sill, back then.
Not every window in the old days had a cast-iron radiator in front of it, esp. if a children’s room had two windows in it.
My son, as a child of about 1-2, put a piece of garlic bulb up his nose. Must have thought he was part Italian - we weren’t. Off to the emergency room we went.