This is going to sound really dumb, but it works... It's a trick that can make some picky snakes eat, but once I used it to coax a friend's python out of a wall (don't ask, he's dumb... The friend, not the snake.)

Get some chicken livers from a grocery store, or boil up some beef broth, be sure to let it cool off first (lol,) then dip a live mouse or rat pup in it, or in the blood that the livers are packed in. Then put it in a container with lots of holes (the little critter carriers work well.) Then just set it out in the middle of the room. If you have a little fan, point it at it. The scent, and the heat from the mouse will draw them out.

I hope that helps, and good luck in finding your baby!!! Keep us posted.