Retro Chalkboard Pregnancy Bump Stickers - Waterproof and Durable - Includes 8-40 Weeks Stickers Made with waterproof vinyl. Extremely durable and very tear resistant. Place these adorable stickers on your baby bump for a unique way to document and share your growing belly starting at 8 weeks through 40 weeks of your pregnancy! Perfect addition for photo albums & baby books! Great way to track your pregnancy milestones and create a lifetime of memories! Great gift for expecting mothers and for baby showers!