Child display macro updates not changing last updated time

[Nikki Cantrell]

We use the "last updated" time through the api to determine if the page was updated and we need to pull in a new version. When using the child display macro, the page is updated everytime there is a new child, but the "last updated" time does not change. Can someone please suggest a workaround on how to determine when the page is updated to know we need to pull a new version?