Another mechanism, which has been suggested by Toronto's medical officer of health in a report addressing children's health as well as been supported by my organization, is the notion of an overarching mandate and cross-departmental commitment to ensuring children's health protection across all of the areas where regulated activities can have an effect on children's health. It's a way of focusing attention and requiring coordinated activity across multiple departments, because issues of children's health will arise across multiple departments, in the examples you give and in others.
If it's at that level of commitment, there's money for it, there's coordination, and it gets done.