When you see your dietitians, make sure they actually weigh your child. I was surprised to see our dietitian, despite seeing her 4 times in a year, never once weighed her - in fact she never even had scales. Despite her weight loss - which we mentioned at every appointment, she never prescribed a supplement. I thought this must have been quite normal, until we saw another one at abby's consultant follow-up. She spoke to us for an hour, talked about her weight a lot, went into depth with what we fed her and how much she ate, and even at one point diagnosed me with a milk intolerance too! She was so much more thorough than the other woman who just sent us away with a " just keep trying her with milk" attitude. I couldn't see the point of possibly upsetting her tummy to "test" her intolerance and the new dietitian agreed.
So just like with HV's, very much good ones and bad ones out there. If you think yours is being unhelpful, make sure you see another one!