tried dd at 21months happy to go for wee on potty, went on holiday and did not continue whilst away. BIG MISTAKE> dd now 2.5months, tried again to train her 2 weeks ago, she holds on to the wee, last time it was 6 hours. health visitor seems to think it will not do any harm, dh concerned cause promblems with her bladder/kidneys. dd asks for barbie knickers as she does not like the nappies, but no end result. she is a clever little girl and is fully aware of needing to go, but seems to precious to part with it HELP PLEASE ANY ADVICE