The Midrash (Tanchuma Tzav #14, Vayikra Rabbah 7:3) advises one to start teaching their children with parshas Vayikra, since the korbonos are pure, just like children are pure. This is brought by the Kol Bo #74 as the minhag, subsequently brought by the Shach to Yoreh Deah 245 s.k. 8, and Be'er Heitev ad. loc.
Aruch HaShulchan ad. loc. seif 11 brings it as well, and writes:
כדי שיבואו טהורים ויתעסקו בטהרות, ועוד טעמים יש בזה.
so that pure ones will go delve with purities. And there are additional reasons for this.
What other reasons for this minhag is he alluding to? The above Tanchuma adds one more, that it's to teach us that reading about korbonos is as if we brought them. Are there any others?