Babies are a very convenient demographic to stand up for, since they can't make demands. Women's bodies are their own - if women want to get an abortion, that is their choice, and it is disgusting that people feel they should be able to tell them what to do with their wombs.
In the context of Iroh's character it makes complete sense though. He had a... "grand" life as a general in the first nation, but realised it was not what he wanted when his son died in the army. At least, if I remember correctly.
Babies are a very convenient demographic to stand up for, since they can't make demands. Women's bodies are their own - if women want to get an abortion, that is their choice, and it is disgusting that people feel they should be able to tell them what to do with their wombs.