Which diaper brand absorbs the most liquids?
If it’s for a project–I’m guessing it’s a science project–you’re going to need to conduct an experiment. Buy a few diapers of different brands, formulate a hypothesis, design an experimental set up, and proceed. A good way to do it would be to add say a mL at a time to each diaper, giving it time to absorb, and then adding another mL. Stop adding more liquid when the diaper stops absorbing and the liquid either stays pooled or runs off the diaper. Record the amount of mLs. Repeat with the other brands. Probably you’d want to do 2 or 3 diapers per brand and then average out the results.