Any number of small child which has wondered so far from his or her caretaker so that the child chances becoming the responsibility of whom ever else is shopping nearby. Since the name of the child is unknown and most likely the child isn't old enough to know their own name they become named after the store they were found in.
This may occur for several reasons:
1. The child is a space cadet (see def. of "space cadet
2. The caretaker or parent is neglectful
3. The parent is a single parent
4. The child is a real crap head and hard to control
5. The child is child #10 of 15
Term and definition may also apply to other common department stores such as: "Walmart baby" "Walgreens baby" or "99 cents store baby."