juvenilize
[ joo-vuh-nl-ahyz ]
/ ˈdʒu və nlˌaɪz /
verb (used with object), ju·ve·nil·ized, ju·ve·nil·iz·ing.
to make juvenile or immature: to juvenilize the classics for quick reading.
to make suitable for or more appealing to children.
Also
especially British,
ju·ve·nil·ise.