I'd say stay away from steerer mount designs, go with something like those below instead. https://www.google.ca/search?q=top+tube+mounted+child+seat&num=100&newwindow=1&rlz=1C5CHFA_enCA513CA514&es_sm=119&tbm=isch&tbo=u&source=univ&sa=X&ei=eDfBU66tD462yASonICQAQ&ved=0CB0QsAQ&biw=1682&bih=956
@withered_preacher started
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I'd say stay away from steerer mount designs, go with something like those below instead.
https://www.google.ca/search?q=top+tube+mounted+child+seat&num=100&newwindow=1&rlz=1C5CHFA_enCA513CA514&es_sm=119&tbm=isch&tbo=u&source=univ&sa=X&ei=eDfBU66tD462yASonICQAQ&ved=0CB0QsAQ&biw=1682&bih=956