Baby walker

Baby walker: A device that allows a baby to move about in a half-seated, half-upright position. A 'walker' may paradoxically delay a baby in development. The baby using a walker tends to be slow in reaching motor milestones such as sitting up, crawling, and walking and other milestones such as those involving memory, learning, and language skills.
Found on http://www.medterms.com/script/main/art.asp?articlekey=10773
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