These two volumes of the Treasure Box Books contain a very simple story of Mary's life, appropriate for very young children. The full-color illustrations are quite charming. Please note that this story has the marriage of Mary and Joseph come before the Annunciation, which is not in accordance with the actual Bible account. Perhaps the authors felt that very young children weren't ready to understand this part of the story.
Update from webmaster, March 2024: Bible scholars tell us that what is often translated as "betrothal" was really the first part of a two-part Jewish wedding rather than an engagement; in the time of Christ, these two parts were celebrated on separate dates separated by as much as a year. However, the couple was legally married after this first ceremony although they would not live together until after the second. This is why Matthew 1:18-19 reports that when St. Joseph discovers that Mary (his "betrothed") is with child, "her husband Joseph" resolves to divorce her (or send her away) quietly — husband and divorce, because they are legally married. See this article for more details and some profound implications for familiar Gospel passages: No, Mary Was Not an "Unwed Mother." Thus, the Treasure Box account is (perhaps unintentionally!) rather accurate on this point.