The phrase "sweet keepsake" refers to a special item or memento that holds sentimental value and reminds someone of a cherished memory or person. Full definition
White Clay Fingerprint Christmas Ornament and DIY Snowman Fingerprint Ornaments from Mum in the Madhouse — Such sweet keepsakes of tiny fingers (reallifeathome.com)
Love all of your unique touches, from the skates on the sweet sled, to the glittered antlers and your wonderful table, all set with sweet keepsakes from loved ones. (celestinamariedesign.com)
After all the fun is over you have a sweet keepsake for your tree — and possibly a gift for the grandparents, too. (mommypotamus.com)