T.P.
I just began taking my 5 and 3/4-months-old son into the pool in my gated community and he LOVES it; I've made a set of 'rules' to follow and so far they seem to work very well:
*no dunking; keep his head out of the water as much as possible so he doesn't swallow the chlorinated water
*rinse off thoroughly immediately after every swimming session
*either hold an umbrella (w/ assistance from hubby) over him at all times or stay in the shaded corner of pool (depends upon time of day) so he stays out of the sun since my Ped doesn't want me to put sunscreen on him til after 6 mos. (FYI: Baby Banz makes great sun hats, sunglasses, and swimwear - I've ordered a bunch and it's all great stuff and good ordering service)
*keep an eye out for other kids so I can keep him away from them - I learned the hard way how easy even a small cannonball can completely soak and frighten the baby
He always draws a crowd when we go in, and he loves the attention!!