Launched a year ago, The Caterpillar is a quarterly children’s magazine featuring fiction, poetry and artwork for children aged 7-11. Read the poem and story on their site to get an idea of what they like, or better still buy a copy. They accept fiction up to one thousand words and up to six poems as word or pdf attachments (the poems should be in a single document). They prefer email submissions but do provide a postal address, and it can take up to three months for them to respond.
I haven’t been able to find a link to buy a single copy (rather than a subscription) from the site so I’ve emailed them for information. I’ll post more when I can read a copy. From what I’ve seen so far it looks like great fun and a wonderful opportunity for writers if you can fit their gently humorous style.