I honestly don't think that any rabbit is good to have for small children, but if you could pick one that would be worst, I think it would be a netherland dwarf!
Young children want to cuddle and hug pets, and rabbits are prey animals so when they are being cuddled and hugged they actually think they are about to be eaten which as I'm sure you can imagine is very frightening for them. Rabbits are better pets for older children who are happy to just watch them and interact with them by sitting on the floor quietly and letting the rabbits come to see them if they want to. Sadly rabbits are often looked upon as an easy first childs pet and nothing could be further from the truth, one of the most common reasons for rabbits being taken to rescues in the uk is that the children get bored - mainly because they discover that they can't handle and hug the rabbit as they want to.
Personally I think that smaller rabbits are worse for children because they stand more chance of having bones broken etc because young children (e.g. under the age of 11) are simply unable to handle them effectively. A rabbit that feels insecure will struggle and is likely to be dropped or grabbed, resulting in broken bones or worse. Netherland dwarves have a tendency to be particularly 'skittish' and highly strung, so although I would actually say the same about all rabbits, I would absolutely 100% avoid this breed for young children!