Popsugar Family Maternity Halloween Costumes Maternity Costumes 27 Creative Costumes For Expectant Mamas 3 October, 2018 by Rebecca Gruber View On One Page Photo 1 of 8 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 1 Bun in the Oven One of pregnancy's most classic phrases, a "bun in the oven" is the perfect Halloween costume for an expectant mama. So literal, yet so brilliant. Previous Next Start Slideshow Maternity Halloween CostumesEasy CostumesDIY CostumesHalloween CostumesHalloween Costumes For WomenHalloweenPregnancy