This is the bass loop that appears throughout the song.
--------9----------|
------------7--6---|
--7----------------|
-------------------|
--------9----------|
------------7--6---|
--7----------------|
-------------------|
[ Tab from: https://www.guitartabs.cc/tabs/o/ol_dirty_bastard/baby_cmon_btab.html ]
it is a very similar pattern to the Raekwon song "Guillotine" which makes me think that
RZA probably makes most of his own beats from scratch with a sampler or something of the like.
guillotine (slightly different timing, not a bass line) :
------9---8--------|
-------------7--6---|
--7-----------------|
--------------------|
