Baby on board signs for cars . The combination of bright colors and prominent patterns will allow other drivers to notice the reminder at a glance to reduce the horn sound, no collision and only gentle driving . And your baby is still sleeping. Baby on board car stickers are constructed with Extremely Durable material that Withstands Tough Weather for Long Lasting use. Don't worry about falling. Nanopatches are very useful. No trace will be left when removed. You only need to make the car's surface clean and dry before using the reflective sticker. Simply peel off, without any residue left on your window.