Which Brand Of Diapers Can Hold The Most Water?

Im in the the 5th grade and i have a science project thats do. I was wondering if you could give me some pointers on how to start go about doing the research? My topic is, what brand of diapers hold the most water?

Pampers

If this is a science project... I would suggest buying at least 3 different brands.. The most expensive..the middle and the cheapest...

1. Take the first diaper, and measure the central part with a ruler drawing a square 7cm by 7cm, with the pen.
2. Cut it out so you end up with a 7cm square of that diaper.
3. Take out one of the bowls, and label it with a sticky note that has the name of the diaper
    that will be used in that bowl.
4. Measure 500 ml of water in a graduated cylinder.
5. Pour the 500 ml. Of water into the bowl.
6. Place the diaper square in the right bowl.
7. Repeat steps 1-6 for the rest of the diapers.
8. Wait 5 minutes for water to absorb into the diaper
9. Remove diaper from water but allow it to drip back into the bowl for 15 seconds.
   Throw the diaper piece away.  
10. Pour the water in the first bowl into the graduated cylinder.
11. Measure the amount of water in the cylinder.
12. Subtract the amount of water that was in the graduated cylinder after the diaper
     was thrown away (step11) from 500  
      (The original amount.)
13. Record the amount of water that absorbed in the diaper.
14. Repeat steps 9-12 to the rest of the diapers.

It would be Huggins if you were smart!