Marymac, try what Sonsie suggested to me when I wanted the tune to a Scots song:
"Try doing lyric searches at the Mudcat Cafe - <A HREF="http://www.mudcat.org"" TARGET=_blank>http://www.mudcat.org"</A>
If you have other information about "Nobody's Child," to tell us, that might help. I have no idea if it's Scots, not, traditional or not. Helps to place it in time and space to get some answers.
Good luck!
Rhiannon