I did notice that they were wrong. I ended up making the 6 month sizes, anyway with different yarns and needles.
I don't think that the errors are that big of a problem, if I recall. It works out to be a few stitches off, but as long as the raglan decreases are done in the same place and the sleeves are the same as each other, the sweater will look fine. You might have more body stitches than the pattern says, but for a baby sweater it really doesn't matter, at least to me.