best snaps for baby clothes?

I've just started making little onesies and jumpers for my first LO due in February and I'm having a hard time with the snaps.  

I bought some snap setting pliers and a few packets of the metal snaps from Michaels.  There was only one size - which looked average to me - so I just went with it.  Now I'm thinking they're too heavy duty for baby clothing, not to mention a major pain to undo.  I think I've ruined the fabric around one of the little legs and will have to redo that whole area ...  

So my question is this: are there any small snaps that will work with this snap setter I just spent $15 on?  What size am I looking for?  Or, are all of the tiny baby-friendly snaps sew on?

Oh, and a lot of organic baby clothes toot "nickel free" snaps, while seemingly all of these snaps I'm seeing at Joanns, Hobby Lobby etc. are made of nickel or plastic.  Maybe I should just hand stitch the plastic ones?  Sigh.  Seems like a ton of work!

Snaps can be tricky especially for tiny baby items. There are snap strips you can buy which allow you to sew on the snaps easier since they are already on a tape.
Since you may be making many more items requiring snaps, you might want to take a look at this site which has a whole slew of snap types & sizes: http://www.kamsnaps.com/

Snap tape is what I use. You can pick it up just about any local sewing shop, although the link above is awesome!