They are supposed to weight about 4 pounds
The smallest is the mini lop.
Lop earred rabbits can have as few as one bunny to as many as 10. A normal size litter is 4 to 6 bunnies.
Lop eared rabbit
American fuzzy lop
Six is a rather large litter for a HOlland Lop. Congratulations.
It can be down to many things, just as with humans even within a 'breed' bunnies can come in different sizes. i.e. French Lop range from 10 lbs to 18 lbs It could be the bunny is not the breed you thought it was, i.e. You though Standard Rex, but your bunny is a Mini Rex or you think French Lop and the bunny is a Dwarf Lop etc. It can be environmental, if the bunny hasn't had the nutrition it needed or some ill health, medications etc Your bunny could be a cross breed, so a French Lop X with a Dwarf Lop would produce a smaller bunny. It could just be genetic, the bunny is just smaller than average in the same way a person might be small or larger than average.
some good bunny breeds for beginners are: New Zealand Dutch Himalayan Holland lop Jersey Wooly American Fuzzy Lop Mini Rex
Lop Ear Bunnies usually weigh about 5 pounds and shouldn't be any heavier.
At any pet store=p
Lop Ear or Lop Eared means your bunny has ears that hang down rather than stand up.
No. The Holland Lop originated in Holland and weighs 4 pounds. The Mini Lop originated in Germany and weighs 5 pounds.