I'm intending to bring my LO for a swim at normal swimming pool. Is there anything I should take note? She will be 4 months old next month. What type of swimming diaper should I get?

I actually started around 4 months. But I started in the baby pool and got floats and made sure I was holding her up the full time. For swim diapers I use Huggies swim diaper and a swim suit on top