It's funny when I hear people talking about the age for potty training. All of my kids - well except for my special needs child who is still not trained at 19 years old and likely never will be - but all were trained by 2 and that was the norm back then. Yes starting to use the potty chair on your first birthday was normal. Disposable diapers stopped at size 4 - there was no need for anything bigger and pullups or night diapers didn't exist. Very few kids were not trained. But then kids ate earlier, used cups, used utensils, chewed food, etc a lot earlier too.