Here's a postcard depicting what appear to be African American teenagers (certainly not small children). The title on the card is "The Blackville Serenade" but the item is described as being from the publisher's "Pickaninny Series": Postcard

I don't dare look for more examples at the moment. I'm in a public library, with a group of African American teens at the next computer. I do not wish to offend them if they happen to glance at this computer screen and see similar images! Bye for now.