Updated 2020: Appears Defunct, could not find recently published work.
MB Publishing is a small press based out of Bethesda, Maryland. They focus on publishing children’s books and Judiaca (things pertaining to Jewish life and customs) also largely aimed at children. MB Publishing was founded over 5 years ago by Margie Blumberg as more or less a self-publishing operation. She still continues to publish her own work through MB Publishing. There is an old interview about the details of that here.
I hesitated to review MB Publishing because of that, however, they have published a number of other authors over the years and their books all appear to be professional-looking. The quality of the books appears much better than most presses that started out as (and continue to be) self-publishing projects, at least in part.
The website is well-organized and easy to use. It is easy to buy books through the website and the focus is on readers, not authors. A number of the books have been positively reviewed in newspapers and by professional book reviewers, and a few have won minor awards.
They have published largely picture books but are open to submissions of novellas, novels, and non-fiction (all aimed at children, presumably).
If you are submitting a picture book, submit the complete manuscript. If submitting a larger work, just send in the first two chapters. They accept submissions by email and post but different response protocols are in place for each, which they make clear on their website.
You can learn more by reading their complete submission guidelines here. They changed their submission guidelines in the last year and the contact us form they are using now, I don’t like as much. It seems like something I am more used to seeing on a vanity presses website. Please approach with caution, and email me at support@authorspublish.com if they ever ask for money.