I am so sorry! I just read your babys story, and I am so sorry. You did everything you could, and we all know you tried your best. Even though you only had him a few days/weeks(?) he loved you, and you loved him, you can tell by the way you tried to keep him with you.
That little guy had a strong way about him, he held on as long as he could, and I like to think he fought as long as he could so he could show you the way a bunny can love you. There are many who have lost such young babies, and I am sure its normal to think you may have done something wrong...
Binky-free little fighter, we know you were sent to your mom and dad for a reason, and they will always miss you, as those who followed your story will too. :rip::rainbow::heart: