Am I being unreasonable?

S🌷 • Mummy to my handsome son and beautiful daughter 🐻🦄
My best friend recently told me about a newborn swimming class that her cousin has taken her baby to. They start the swimming sessions from a little under a week old. My friend told me the first thing she wants to do is go with me and my baby right after its born and take it swimming. I am totally against this because of the risk of infections and also because I'm not sure I'll feel like swimming days after giving birth! But my friend seemed to think I was being silly and unreasonable and that it is perfectly safe. She said loads of women do it and their babies love it (not sure how they can tell when they're only a few days old!). But what do you think? Am I being unreasonable? Would my baby really love it?