Your house seems to be exploding in children’s clothes that no longer fit—what’s a mom to do? Before you start tossing willy-nilly, take a cue from these tips for downsizing your clothing collection.

When I gave birth to my first child, the clothes were part of the fun: dressing her in adorable onesies, shopping for baby outfits, gratefully receiving hand-me-downs. Fast-forward six years: Two more ...