Ideally you want the cg dead in the center of intersection of the three motors (such that the shortest distance from that point to any motor center is identical), and from the side, you want the cg even in height with the centerline of the props. Of course the baby props are uneven in height, so ballpark that in the average height.
But in practice, copters are very tolerant of out of whack cg’s so it really doesn’t matter much unless you are way out. Symptoms of that might be uneven rotational response about each axis or non-axial rotations.
The point being that for most situations getting the cg in the general area described above and you will be happy. Given the size of the baby, it would be hard to get the cg out of whack enough for anyone to notice I would guess.
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