What to take note for baby's first swim at public Swimming pool? She is 10month old now. What should I prepare? Should I apply sun block for her? if the chemical ok for baby? What time is the most suitable?

My baby went to the public pool since 4+months. No problem. Personally I prefer late afternoon .. As morn, the water may be too cold n not warm enough ... Late afternoon I feel the water is warmer since the dun has been shinning it for so many hours already ... I always forgot to put sun screen for my boy though but I'll try to let him swim under the shade if possible