They finally erratad the baby dragon's breath weapon DC! I noticed years ago that to scale a young green dragon down from level 8 to level 4, the DC 25 on the breath weapon should have been lowered to DC 20 per creature scaling rules. They properly scaled the strikes and the breath damage but neglected that, keeping the DC at a puzzlingly high DC 24. So of course it hits harder than it should. In the ORC reprint, the juvenile horned dragon has the DC lowered to 21 which fits the level 4 range (I'll quibble to be consistent it should be DC 20).
However, they did not update the actual adventure text just the stat block. The poison breath paragraph still shows "Anyone caught in this breath must roll a basic Reflex save against a DC of 24."
They'll want to update that since it looks like an oversight.