May be completely irrelevant for you, but my DS would find too much rice constipating, so I started out trying to limit it with DD, however it turned out that wheat has that effect on her (we don't need to avoid it completely any more, just limit it - actually when first weaning we also had to avoid oats), but rice has been absolutely fine for her, and rice cakes are pretty handy
funny how they're so different, isn't it?