Give peace and your old jeans a chance! just loop, snap and go. each b-buckle has 3 adjustments for the perfect fit. order your pre-pregnancy size. small fits 0-4, medium 6-8 and large 10-12. When your belly starts to expand, don't bother buying a new pair of pants, just add a b-buckle. b-buckles are the hippest new maternity accessory for savvy mamas. Available in fabulous colors and designs, these wardrobe savers are cool like a belt buckle and practical too!