Lincoln1809,
Having come across some dead folks during my career, the decomposing of the body, the gas in the body in the bowels and stomach are the first thing to bloat. Rigor Mortis starts to set within 2 hours and totally stiff by 12 hours and gradually dissipates until approximately 72 hours (3 days) after death but, this too is depending on what the weather and where the body is, e.g. in a house and our outside, in winter or in hot summer. The condition of where the body is also depends on how fast the body bloats and, when the 'larva and or maggots' enter as well, they enter any opening and start depositing using the body as an incubator. This too bloats the interior of the body until the body fluids dissipates and by this time the larva/maggots are mature and move on or consume the corpse.
What gets a bit unsettling is having the cadaver have what is called "cadaveric spasms" and or "post mortem spasms."
Hope this helps explain things.
Medical examiners and morticians are good people to talk to in exploring the body after death.
Respectfully submitted for consideration,
M. E. Wolf