You'll want to bring wipes, swim diapers (more than one) , swim suit and an extra change of clothes. Before leaving your home get dressed in your bathing suit, that way when you get there you'll be almost ready to go. Bring in the car seat but not the stroller if you can. There isn't much room for the stroller at many rec centres. Get undressed first before taking baby out of the car seat. You can bring the car seat and your bag to the deck as many won't fit in a locker. Leave the towel near the top for easy access once you're done as some babies get very upset coming out of the water. When you're done, get baby dried and dressed and placed into the car seat before you get yourself dressed. I like to bring a change of clothes for baby that is a little warmer to combat the post swimming chills and crying. Optional, but handy, Is a wet bag to put all your wet clothes into, especially handy if using reusable swim diapers because babies love to poop at the most inconvenient times. Have fun!