Embroidering onesies

[rin-666.livejournal.com]

Hi guys sorry this is a text only question I was just wondering about embroidering baby onesies. I'm having a baby in september and would like to give them some unique clothing (especially as they're being born into what's going to be a very martial arts filled life so that's just screaming for some ninja stuff!) but I was wondering about how to do it? Surely if I stitch straight onto it there's going to be all the knots etc on the back that will irritate the skin? It will be hand embroidered not machine done, any advice you guys have would be just amazing please as I'd really like to not irritate baby's skin and I am completely clueless about this having been in a relatively baby free environment until now! I have looked through the faqs etc but I'm being extremely dens if it is there so sorry if this has already been asked!
Thank ye!

(also if you feel like it any baby craft ideas would be awesome to wanna make this baby feel as loved and unique as possible :P)