DD is 6 months, and has always hated having a bath. As soon as I put her on, she starts crying. I try and make it fun, toys, splashing, but she still hates it. It's getting that bad that I'm considering just washing her rather than bathing her. It's the same if we put her in with me or DH.
DS was like this (screamed like being tortured if put in a bath) and even objected strongly to being topped and tailed. At 11months we tried waterbabies to see if it could break the fear of being wet. It sounds like utter madness but we were desperate. By the 3rd lesson he loved it and was happy with showers. He has always remained unsure about baths though. He's now 3yrs and still does waterbabies and is becoming a good little swimmer.