At what age is a baby bond no longer considered a baby bond?

I have two bunnies. The breeder told me that one is a male and one is a female. I separated them before they reached sexual maturity. I kept them side by side so they could still see and smell each other. Well, today the vet checked again for me and they are both definitely boys. Link is 4 months and Luna (who I thought was a girl) 3 months and 1 week. The vet said I could let them be out together but supervised. So I tried and everything seems fine so far. They sit in each other’s litter boxes together and eat together and hang out together. No signs of aggression so far. They will be neutered in a few months.

I was wondering when a bond is no longer considered a baby bond?

Depends on when hormones kick in and how much effect those hormones have on each rabbit (it can vary greatly). They are both still young enough that those hormones may not have yet kicked in. Only time will tell, I'm afraid.

If you are planning on having them both neutered, I'd suggest doing so as soon as your vet is willing. No need to wait a few months. The longer you wait, the more time there is for those hormones to interfere with their relationship. If they fight, it could sabotage future bonding.

Most vets will neuter males as soon as the testicles have dropped.

^ What Blue eyes said.

Please know that M/M bonds are more difficult than M/F bonds. Like Blue eyes said, most vets will neuter males as soon as the testicles have dropped. If your vet is reluctant to neuter at that point, I would consider looking for a vet with more rabbit experience. The sooner you can have them neutered, the lower the chance is that they'll become hormonal and start fighting. Once they get hormonal, it takes 6-8 weeks post-neuter for hormones to totally dissipate and they'll need to be kept completely separate during that time.

Thanks for the reply. My vet said 6 months but I think I will call around to see what other vets say. They are very sweet together but I am watching closely for changes.

My first rabbits (as an adult, anyway) were two dwarf-breed girls... my vet initially said 4 mos but then he had me wait until 5 mos because they were so tiny (he wanted them to be around 2 kg so their ovaries wouldn't be so hard to find ). 6 mos for males seems awfully old - rabbit-savvy vets are usually quite comfortable neutering males at 3-4 mos old.