I took my baby girl (she is now 6yrs) to a mother and baby swimming course and we both loved it it was very relaxing and we were a small group in a small pool just for us. There was no splashing from other kids and it was nice and quiet we used to call her the water baby now we call her the fish because she loves swimming you can never get her out of the water. I would recommend doing the course.
Have fun and enjoy the experience together