This child has been the family's precious darling since she was little.
Tips
culture
Northern colloquialism. 疙瘩 (gēda) literally means 'a lump / bump' — combining it with 宝贝 ('treasure') paints the child as a tiny round bundle you can't bear to put down.
register
Warm, family-talk only. Don't use it in formal writing; the closest neutral phrase is 心肝宝贝 (xīngān bǎobèi).
