Hi, I will be taking my 18 month old boy swimming for the first time and would really appreciate any tips or inputs on what gear is needed.. one piece swim suits Vs babywarmas (he tends to catch a cold quite easily and gets a runny nose if he isnt wearing a hat)... between back floaters/arm bands/flippers- what works better.. do ineed to buy goggles and ear bands for them or not really required etc.. am feeling excited about it!!