I bought for my daughter. They are actually fortified with iron - which I thought would be a good idea as she doesn't really eat much meat yet. They are supposed to have less salt and sugar as well - actually I have both types in the pantry so will go and check the differences on the nutritional panel.
OK the only differences per serve are:
Everything else is pretty much the same in both - including the iron levels, the major things I can see are that the kids version has only about a third of the sodium of the normal ones and it has calcium added. Interesting that folate isn't mentioned on the kids ones.
Hope this helps.