This adorable kids' book lets boys know tough guys have feelings, too.

Feelings: Everybody has 'em. Even superheroes.

As his young son grew older, a deep-rooted concern began nagging at Keith Negley — an anxiety many parents can probably relate to.

When something would embarrass or upset Negley's son, Parker — on the playground or the soccer field, for instance — Parker would grapple with how to show his feelings.

Sometimes, his emotions would manifest as anger or hostility. Other times, "he'd just shut down altogether," Negley explained to Upworthy.

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