First of all; for tshirts go with the no show mesh, its great. Go to either emblibrary.com look under projects and Kenny's corner to get tutorials for the onesies and the tshirts and advice on stabilizers. Also check out the Floriani website. They have a stabilizer workbook that you can download. I get my no show mesh from them. They have great tutorials as well. Sometimes you can also use a stabilzer on the top as well. Make sure it's not too dense of a design and it'll turn out really nice. Hatched in Africa designs are great for kids clothes since they aren't too dense and stitch out great. Here is floriani's web site
http://www.rnkdistributing.com/cid-3...-Products.html