My family likes to keep green. We need a new mattress for our daughter and are wondering what a good eco-friendly option would be.

meant to be sandwiched between mattress and boxspring

The first reason to have a mattress protector is to keep your bed clean. Our bodies are not as clean as we think even though we take bath every day. we perspire at night, our skin produces oil while some of us put on makeup. All this can get into the mattress and once it gets in, we cannot remove it. A mattress protector will not let this happen.
Secondly, we all love to keep our mattress new. we do not want it to shorten the life of the mattress. Dust mites consume dead skin cells and the dead skin cells will remain on your mattress if you do not use a mattress protector.
http://bestmattress.in/top-10-mattress-protectors-in-india/

You can buy mattresses from Refresh Mattress. You are looking for good products at good price. Refresh Mattress is the best option according to your requirements. You an order mattress online from their website.
Visit: http://www.refreshmattress.com/

I am a fan of the Baby Eco Trends baby changing tables.

I found you a great article with a few ways to try. Good luck!

http://tipnut.com/how-to-clean-bedwetting-stains-from-mattresses/

Sanitizing your mattress is a great idea! I have found you a great "how-to" guide that will take you through the process. Good luck.

http://www.ehow.com/how_2181927_sanitize-secondhand-mattress.html