"We can't just steal a baby," the fighter protested.
"It's the only thing in here that matches the description of what we're here to retrieve," said the rogue.
"Maybe it was already stolen, so really we're returning it?" suggested the bard, jangling his near empty purse at the giggling babe.
The fighter frowned. Their client wasn't human.
Just then the infant bit the bard and didn't let go until sated.
That clarified a few details.