My Bernie had 3 babies 26th April last year and 3 babies 28th of April, first three were smaller and colored, the last three were bigger and very same looking blue eyed whites. All babies survived and now are 15 months old.
She had only one contact with a male so. In this photo kits are probably 3 days old, smaller kits are older and white's are maybe in their second day.
Same day photo
This maybe 7-10 days old, still eyes closed
Smaller kits were not weaker or less active, the tiniest one in first pics, name's Bernardo, he's got one or two extra feedings on Bernie's belly and he is a very active rabbit, he is still smallest of them but I think it was just because they are not purebred and she managed somehow to produce two very different batches same time. The white ones look absolutely same very pretty. Smaller ones are fantastic rabbits and they mostly inherited their father's character, very good rabbits, white ones were more mean to other rabbits.
Here's Bernie and Harley, you can see her in pics above
Harley is 10 months in this photo, it was taken during the bonding process in the cage as you see in first photo of them both
Harley is a beauty, she looks fat but it's just her gorgeous hair, she's like my therapy rabbit