Curse of Youth

This spell reverses time for a creature that you can see within range until it becomes a helpless baby. An unwilling creature must make a Wisdom saving throw to avoid the effect. Shapechangers and creatures that do not experience infancy automatically succeed on this saving throw.

 If the target drops to 0 hit points, it reverts back to its ‘normal’ age, and excess damage carries over to its normal form. As long as the excess damage doesn’t reduce the creature’s normal form to 0 hit points, it isn’t knocked unconscious.

 The target retains all of its game statistics except its base movement speed and hit points, which are changed to 10 feet and half of the target's maximum, respectively. 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 is prone and cannot stand up without the help of an adult.

The target’s gear is unaffected by this spell; it will likely fall off the target due to being vastly oversized.

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 failure, the target remains as a baby until the effect is ended by a remove curse spell. Additionally, if the target drops to 0 hit points, it does not revert to ‘normal’ age, and begins making death saves as normal. On a success, the effects end.