PHOENIX (AP) — Kisha Gulley was once kicked out of a Facebook group for mothers with autistic children after a contentious debate she felt was racial. Over and over, she clashed with the white-dominated groups she'd sought out for support as a new mom.

So Gulley, who is Afro Latina, started her own parenting blog and social media accounts. It's now a source of income for her.

The multibillion-dollar world of sleep training guides, toddler activity ideas, breastfeeding tips and all things parenting has traditionally been overwhelmingly white. Parenting book jackets feature mostly white faces. T...