Perhaps it refers to a baby character that is born out of the creative and often wild ideas in Avengers fanfic. It could be a symbol of new beginnings or a new direction in the fan - written story. For instance, the baby could be the product of a magical experiment gone wrong in the fanfic world, where the Avengers are involved, and this baby then has some strange powers that the fanfic then explores in detail.
No, it's not that common. Most Avengers fanfics focus on the existing heroes and their adventures, not so much on creating a baby character out of thin air.
In the 'baby peter interrupts avengers meeting fanfic', it could be that baby Peter has some sort of special power that activates during the meeting. He might accidentally use it and cause chaos, like making Captain America's shield fly across the room. Or he could just be a normal baby and poop at an inconvenient time, making everyone scramble to deal with it while trying to keep the meeting on track.
One possible reason could be a misunderstanding. Maybe Peter accidentally gets involved in something that looks bad to the Avengers, like being in the wrong place at the wrong time during a security breach. So they misjudge him and are mean as a result.
Well, it could be about the Avengers having to take care of a baby. Maybe they find the baby during one of their missions and have no idea what to do at first. They might struggle with changing diapers, feeding the baby, and making it stop crying. But in the end, they all grow to love the baby and it becomes like a little mascot for the team.
It could potentially refer to a character in a fanfic who is a black baby. Maybe the story is centered around the birth or the early life of this baby within the fictional world created by the fanfic writer.
One idea could be a story where the baby Avengers are in a magical daycare that has strange powers. They have to work together to solve the mystery of why their toys keep disappearing. Another could be about their first attempts at using their powers in a mini - superhero training session. For example, baby Iron Man tries to fly his tiny suit but keeps crashing into things.
Baby Loki is a popular character too. He can be written as a mischievous little imp, always trying to play tricks on the other baby Avengers. His magical abilities, even in a baby form, can lead to all sorts of fun and chaos in the fanfic. And baby Hawkeye, with his tiny bow and arrow, trying to aim at things that are probably much bigger than he can handle at the moment.
Another idea is that Thor used his powers in an extreme way. For example, he summoned a huge amount of lightning and it drained his energy. This energy drain could have had an impact on his physical well - being, including making him nauseous and causing him to vomit. It could be a way to explore the limits of his powers and how they can have negative consequences on his body.
Well, it could mean that there is a fan - created story about Ben 10 where he is depicted as a baby. Maybe it's a really cute and different take on the Ben 10 character, showing him in his infancy with all the things that come with being a baby, like being small and vulnerable and having to rely on others.
It could be a very misspelled and unclear reference. Maybe 'cuts herself' is part of a disturbing or angsty plot in a Bulma - related fanfic. But it's hard to be sure with such a jumbled phrase.