For those of you that would like to knit or crochet your baby a sweater , here are the sites: Each individual will size differently so you will have to look at that while sizing.
for Knitting :
http://www.knitting-crochet.com/crochet/smadogswe.html
for Crochet:
http://www.knitting-crochet.com/crochet/doggie2.html
Good luck to all.