Tetanus, Diphtheria, polio and whooping cough cannot be contracted from chlorinated water and research and advice states that there is no reason to wait to go swimming until the full immunisation is completed however as we generally take babies from 4 months if parents do immunise their babies this will have been done. We therefore recommend if anyone wishes to start earlier or has any reservations they must speak to their Health Visitor or G.P. before starting lessons.