Means child, son; noun suffix
[1]
 
Memory hook Somewhat resembles the outline of a swaddled baby with her arms out.
Grammar Note
Most nouns in Chinese are combinations of 2, 3 or 4 characters. The character is used as a suffix on single-character nouns to help the reader/listener know that the noun isn't forming a compound with the characters that follow it in the sentence.
Combinations
ChineseliterallyEnglish
女子female (noun suffix)woman, female
子女son femalechildren (sons and daughters)
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[1] Asleep in a sea of dots by user texturl from http://www.flickr.com/photos/bbarr/3232402425/in/set-72157613070208256/ under license: Attribution-Noncommercial-Share Alike 2.0 Generic