NEW YORK (AP) — The options for gender-neutral children's clothing are still limited, but growing.

Some big retailers like Lands' End and Zara are making small changes to their offerings, while some frustrated parents have launched their own companies to make the items they wanted to find. Many of the options are unisex T-shirts that have motifs like robots, trains or dinosaurs.

Those smaller companies are among nearly 20 online brands that formed a campaign called Clothes Without Limits last year that they're reprising for the back-to-school season.

More has changed for girls' clothes than for boys, but the vast majority of children's clothing is still gender-specific, says industry analyst Marshal Cohen. He doesn't expect massive change until the next generation starts having children.

"Once we get past the cultural discussion, that's when you'll see the (major) brands step out," Cohen said. "No one wants to risk the chance of rocking the boat."