This charming belly button ring is designed for pregnancy with a flexible bio flex clear bar measuring 25mm in length with 5mm silver surgical steel balls.  It features a baby on board caution sign. Keep your piercing intact with this flexible pregnancy navel ring while your baby bump grows.  The extra length of the bar gives you an option to cut the stem into the length of your choice. This would also serve as a medical alert while you're still early enough that you are not showing clearly. 
 
Specifications
Ball Material: Surgical Steel
Ball Size: 5mm
Charm Size: 15 mm 
Total Dangle Length: 17.5 mm
Bar Material: Bio Flex
Bar Length: 25mm (suitable to cut to your desired length)