I think you are too big for baby diapers. You will probably have to wear Depends. However, I'm sure you could find baby diapers in your size on the internet. Seems like anything and everything can be found if you look hard enough. LOL.
A baby diaper will not but they make adult diapers that will.
As messy as baby diapers can be, typically their poop stays in the diaper if you change them in a timely manner. However, sometimes your baby can have diarrhea or she is very active immediately after pooping. Make sure the diaper size is not too small and most of the time it should contain their poop just fine.
If the boy's skinny enough for a baby diaper. If he's not, try a med. size adult diaper.
There is the baby diaper game, you put semi melted (fun size) candy bars into a diaper and each guest has to taste and write down what candy they think it is.
A baby should wear at least a swim diaper. There are both disposable and washable varieties available in every size. However, you may also want your baby to weay swim trunks or a bathing suit.
On the box, it usually says what weight and size that type of diaper fits. Look on the front or back of the box to find the size that fits best.
Usually they would where a size preemie or maybe even newborn
I guess if you don't weigh more than 110 pounds.
If you mean "what is the adult diaper that holds the most liquid in size extra large", that would be the Dry 24/7 Maximum Absorbency. If you type "XP Medical Adult Diaper Review and Testing" into your favorite search engine you will find adult diaper testing from a company that sells all different diaper brands (so it's more impartial). It included the quantity the adult diapers can hold.
Since there are many variations of the Diaper Dude diaper bag, there are also many variations in size. it is recommended to find the model one wants, then make sure the size is right for the needs.
Get a large size adult diaper. If you're large, then you might need an XL.
The difference is the size and how much urine they can hold. That is after all what diapers are for. If you use it as a fetish you just have to try.