Connecticut is especially dicey because they have a 1:4 ratio right up to age 3; if you have 2 kids under 3, like one of the mothers in this article, you're effectively paying 1/2 of a full-time employee's salary plus your share of all of the other costs (rent, utilities, insurance, supplies, administration) associated with running a daycare.
Childcare is an absurdly labor-intensive business and I don't know how to make it work for non-wealthy people without massive subsidies.
Honestly, good for her but any agreement predicted on the assumption that Trump will still have, y'know, money a year or two from now is not worth the paper it's written on; if she wants to set up Barron nicely for adulthood, the best way to accomplish that is to divorce him and write a tell-all book.