I didn't have childcare costs but I did send mine to a fee paying elementary school.
School fees apart, the first big expense came with extra curricular activities and sports - kit, gear and participation fees plus travel - from age 5 to about age 13 for five of them. After that sports in high school were far less expensive. They learned to drive in school as part of their PE curriculum, which was very nice.
I suppose, the general cost of living in a good school district (property taxes or rent) can be factored in - in order to send them to a very good public high school here I pay a good deal more rent than I would have to if school quality wasn't a factor. However, house prices remain high in a good school district so this is a good bargain for a home owner.
Then there was the clothing thing. It hit about age 13.
DS in particular went through a phase where he outgrew basketball shoes and his other shoes too really fast - he needed new footwear every four months for about two years. He finally stopped growing when he was in size 13 US. The next biggest size for him would have been custom-made shoe territory.
University education was not that expensive for us even though I am in the US. My DCs so far have had financial aid packages and scholarships that have been great.
My DCs all had jobs throughout their teenage years - babysitting and odd job work, and they worked during school holidays too. In university they had jobs to support themselves. I did not send any of them any money to any of them while in university. They all lived at home during summers while at university, and the increase in the food bill was noticeable. But food and utilities and any toiletries they did not buy for themselves were the only things I provided. They were all buying their own clothes and footwear by about age 16