What is the best age to start children for swim classes ? Baby , toddler or preschoolers?

swim schools usually start 6months onwards. if you're comfy you can bring your baby to pool at any age. splash slash here are there. both my kids started at 3 months. so they got used to the water. as a former swim coach is good to get your kids used to the water. especially have them used to water on their face. .. =)