We have used a baby holder seat thing in the bath since W was about 8 weeks old. It has an adjustable thing at the bottom that stops him slipping down and it suctions onto the bath. He was getting too heavy for DH to hold and lets him have both hands free. I am not sure if this is what you are asking about though because I don't think he will fit in it by 6 months? Are there different bath seats for older bubs?