Wick is a true Netherland Dwarf born early November 2016, making him a little over 5mo now. Wick is a runt though; he was about half the size of the rest of his litter when we received him, so if your numbers align with below, you have a really small bun. If they’re slightly higher, my guess is your rabbit is on track to being a true dwarf. Aside from weight, you will need to examine characteristics. They say true NDs will not have ears longer than 2-2.5in, and the look like a round ball, rather than just a small rabbit (no real long, snout face at all). They have big eyes and their coat is a roll-back (I believe it’s called), which means if you brush it the opposite way, it will slowly go back to position, rather than flying right back into place.
When I received him at 9w (so mind that Wick is older than yours atm) and for a couple weeks following that, Wick weighed between 400-550g, I believe. Currently, he is 714g (as of two weeks ago), so 0.714kg or 1.5lbs.
Nothing wrong with a false dwarf or a non-dwarf breed if that ends up being your scenario. All bunz are great bunz.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.