bundle of joy (plural bundles of joy)
- (idiomatic) A newborn baby or child of any age.
- 2005, Judyth Reichenberg-Ullman and Robert W. Ullman, Rage-Free Kids, Picnic Point Press, →ISBN, page 132:
- Nature took its course, and Marie did give birth to a bundle of joy, but she soon discovered that motherhood was not all bliss.
- (idiomatic, less common) A pet.