Spell it above with felt letters like this Monthly Photo Idea from Famille Summerbelle. Monthly Baby Photo Ideas - Track Your Babys Age in Photos plus FREE Monthly Printable Milestone Stickers and Signs on Frugal Coupon Living.
Weekly baby photo on a different yard of fabric each week! (Then use the fabric to make the baby a quilt & some other projects!) :) She explains how to Photoshop the weeks onto the onesie. Wish I had seen this earlier!