http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1 volume (unpaged) : color illustrations ; 28 cm.
Follows the adventures of young Gus and Nellie, who watch their mother's pregnancy and anticipate the arrival of a new sibling while learning engaging facts about how unborn babies develop.
Robie H. Harris; illustrated by Nadine Bernard Westcott.