The Best Way to Start a Business Isn't With Finances ... It's With Your Own FrustrationTwo moms started a business when they saw a problem with the kids' clothing market. Their solution is now the booming clothing brand Primary.

Moms know how to solve problems, and back in 2012, Christina Carbonell and Galyn Bernard spotted a problem. They were on the marketing team of Diapers.com, and both had small kids at home. One day Bernard complained about how her young daughters wanted orange jackets but the only options available were in the boys' section. Carbonell had been equally annoyed at what she saw as an overpriced, overdesigned, and gender-specific kids' clothing market — so the two set out to fix it. The result isPrimary, a brand that sells affordable, genderless, simple kids' clothing (no logos, no sequins), which has since raised nearly $50 million and grown to a team of 50. Here's how they did it.

1.Find a unique business model.