Surrogacy?

Hey everyone! Today, I heard my sis was asking my mom about how long she breastfed us all and it triggered in me a few thoughts.... One, if my sis couldnt have kids, which would suck, i was like what if i had a kid for her and have her raise it?! And then, i researched a little bit about the emotional impacts of surrogacy and wanted to ask what you guys know about it, if u have done it, etc. That was my second thought. Any ideas appreciated