I guess you must be first time mom. Relax and don't rush yourself too much.
When my daughter was born, I tried to get one. Then I found my daughter did not enjoy it. So I delayed it and have some try when she was > 6 months. She cried a lot and did not like it, too. So we delayed it again. But we started to take her with a shower every week. Of course, parents have to held the baby.
Around her 1.5 yrs old, we toke her to join the city program for toddler. Now shes love swimming very much. She still follows the city program and takes 1+ extra hours for leisure swimming.
So no rush for your baby and follow your kid feeling and process. Enjoy the process...