I'm a mom of 3 and an interior designer. It's OK not to give your kids the decor they're asking for.

Lauren Behfarin has three kids and designs kids' rooms for a living. Courtesy of Lauren Behfarin Lauren Behfarin lives in New York with her three kids. She says it's important that parents don't just default to kids' aesthetics. Designing with the next parenting stage in mind can save time and money, she says. This as-told-to essay is based on a conversation with Lauren Behfarin, founder of Little Room Supply. It has been edited for length and clarity. When I became a mom 12 years ago, ever...