hi,

in regards to bath seats i found something very interesting, i found that with the child i didnt use one with she would cry and be more disturbed with bathing times as water would get in her ears she hated it. There was no medical reason why either. As for the others much more relaxed as the water didnt fill the ears as much as the first born.
Its much safer too i believe with a seat as your hands are more free. If choosing one i would choose one with the insert between the legs. iIhave just bought another one for this baby the other one i had was a fabric ramp style but still worked good but i dont expect it would have worked as good as the specially molded ones they have these days. The stopper between the legs sorry i don't know what to call it is adjustable. I also found when picking one not all had the best neck support and some had holes (slits for the water to run through behind the babies head. this was the type i bought for the above reasons. Non slip too or at lease but a non slip mat in the bath.

hope this info helps