UrbanBaby is a New York-based Internet forum devoted to anonymous discussion of urban motherhood founded in August 1999 by Susan and John Maloney.
The site gained attention by many parents across major cities but mostly in New York.
The site was later bought by CNET.
The site had employed David Karp as a software consultant before he went on to found Tumblr using his earnings from (and experience gained during) his time at UrbanBaby. 
A similar site in Japan is the Yomiuri Shimbun's Hatsugen Komachi.