Curse of Youth

This spell reverses time for a humanoid that you can see within range until it becomes a helpless infant. An unwilling creature must make a Wisdom saving throw to avoid the effect. The spell does not affect a shapechanger, a creature that does not naturally experience infancy, or a creature with 0 hit points.

The target retains all of its game statistics except its base movement speed, which becomes 10 feet and hit points, which becomes 1. It retains its alignment and personality. 

It cannot take any actions, bonus actions or reactions, cannot cast spells, and cannot communicate, except by crying (a person using the spell comprehend languages or similar abilities can interpret such crying to gain a rough understanding of the baby’s emotional state). While under the effects of this spell, the target’s only movement option is to crawl. The target’s gear is unaffected by this spell; it will likely fall off the target due to being vastly oversized.

When it reverts to its normal form, the target returns to the number of hit points it had before transforming. Any excess damage carries over to its normal form if it reverts due to dropping to 0 hit points. As long as the excess damage doesn’t reduce the creature’s normal form to 0 hit points, it isn’t knocked unconscious.

At Higher Levels: If you cast this spell using a spell slot of 6th level or higher and maintain your concentration on this spell for the entire possible duration, the target makes another Wisdom saving throw. On a success, the spell ends. On a failure, the target remains in its childlike form until a remove curse spell or similar magic ends the effect. Additionally, if a target drops to 0 hit points after being affected by the spell for the full duration, it does not revert to its original age. It begins making death saving throws as normal.