Alyssa Monas sits before a half-dozen toddlers, clutching a steady old friend, the $150 acoustic guitar her mother bought for her on a cable shopping network ages ago. “Good morning, friends,” Monas ...

For many parents of babies and toddlers, there is one YouTube channel that is a household name. Ms Rachel and her Songs for Littles has attracted nearly 17 million subscribers, offering a colorful, ...