I'd still say it's worth it, especially if you do it while he/she's asleep.

rip open a (preferably) not used diaper

i think you're thinking of ammonium nitrate... sodium polyacrylate is mainly used in diapers. oh, and i hope no one gets the idea to eat it-- they'd be stopped up for days, haha

umm, ok, I am part of my family biz, and we make gel type freezer pack, not the quick freeze packs. The stuff we use in manufactured by a company in the UK, the company is called CIBA specialty chemicals. the substance is an organic silicone variation, it comes in various diameters and mesh sizes. normally in the form of granules or powder. it expands 100x it orginal size when added to water. so it makes a great medium to store water for making ice. the gel is put into a plastic bag and seal, pop it your freezer, they stay frozen in your cooler or whatever 150% longer than if you were to use ice. due to the properties of the gel water solution, it does get every were if the bag is punctured. it is also similar to the compound that most soft contact lenses are made of. ammonia nitrate an oxidizer, fertilizer, and it is difficult to make. from what I gather it does not generate any cooling effect in any chemical reaction that I know of, and if it does, i can not imagine it being very effective. however there is a chemical called urea, it has an endothermic reaction when added to water, normally used as a cold compress. urea is put in training pants for toddlers, so when they go by accident, the diaper portion gets rather cold fast, it some how supposed to motivate potty training.

no, but sodium acetate has it own cool properties, it is used in "rechargeable" hand warmers.

it absorbs the water and since its white when u show the cup to people they think whoa its gone when it isn't and if done right u can tip it up side down and nothing will fall out making people think its MAGIC

I think what he mean is that he has bad grammar.

aah I got ya.