The Poetry section of the Review Room is not subdivided. If you want to indicate that it's a poem for children, mention it at the top of the post. There aren't many children's poems posted, although some of Poempedlar's poems were written for children. Just an FYI - only threads containing writing ready for critique should be posted in the Review Room forums. The Review Room is a writing and critiquing workshop with stricter posting rules than the rest of the site.
if one is writing rhymed text for picture books, it goes in the 'children's stories' section of the review room's 'short story' area... otherwise, it's just 'poetry' and goes in that section with all other kinds of poetry...