Well /sci/? Is this person's baby's underwear going to melt?
Are we trying to be funny or are we being serious? I honestly don't understand what really happened to her kid and the underwear. I know that pure lye can give you a slight chemical burn right? I'm not going to answer them. I just thought it was funny/retarded.
What happened is the parent had a pair of underwear go down the drain. The kid is fine as the lye won't be used around him; the parent is considering putting lye down the drain to dissolve the underwear. Lye is good at dissolving cotton because it catalyses hydrolysis reactions and cotton is just a big tangle of cellulose polymer.