When is it okay to bring LO to swim? Need thermal swimwear? Waterproof diapers? Where to get it? Thanks

Ermm.. I did mine at 3 months. Now that you are asking im wondering if thats tol early. However i brought mine to a heated pool. He wore swim pants only ahahaha. I did not use water proof pants. I just purchase swim diapers. You can purchase them at most NTUC.