At first, Spider Man might be in shock. But then his sense of responsibility would kick in. He would be constantly vigilant, always on the lookout for any threats to the baby. He would try to provide a normal life for the baby as much as possible. He might move to a more secluded place to keep the baby away from the chaos of his superhero life. He would also tell the baby stories about his adventures, not only to entertain but also to teach the baby about courage and doing the right thing.
Spider Man would probably be very protective. He'd use his agility and strength to keep the kid out of danger. For instance, if they were in a fight scene, he'd quickly web - sling the kid to a safe place.
Spider - Man would probably be shocked at first. He looks up to the Avengers and being kidnapped by them would be the last thing he expects. He'd likely try to talk his way out, using his quick wit and charm. He might start by asking why they're doing this and try to convince them that they've made a mistake.
Spider - Man would be very confused. He would feel betrayed because he thought the Avengers were heroes he could trust. He could start by asking them why they are doing this. If they don't give him a satisfactory answer, he might try to escape in a sneaky way, using his spider - like abilities to find a weakness in their capture setup while still trying to reason with them.
Spider - Man would probably be defensive at first. He's used to working alone most of the time, and being interrogated by the Avengers would seem unfair to him. He might crack some jokes to ease the tension, but also firmly state that he's a hero too.
Spider - Man first assesses the situation. He figures out the patterns of the demon crimes. Then he uses his intelligence to come up with strategies. He might also call on his friends in the city for help, like the police or some of his super - powered allies if the situation gets too tough. And of course, his suit gives him an edge in combat against the forces behind the demon crimes.
She could have the same powers as Spider - Man, like super strength, agility, and the ability to stick to walls. But maybe her web - slinging is a bit different, like she can create different types of webs, perhaps ones that are stronger or have special properties.
Spider - Man could use his agility. He could quickly dodge Ultron's attacks and find a weak spot in Ultron's armor. Since he's so fast and nimble, he could get in close and plant some sort of disabling device he made with his scientific knowledge.
You could have a character use some sort of special weapon or gadget designed to deal with spiders. Maybe a high-tech spray or a laser device.
Well, perhaps the baby is actually the result of some sort of science experiment gone wrong that Spider Man stumbles upon. He then feels responsible for the baby's well - being. He has to balance his superhero duties with taking care of this little one. He might seek help from his friends like Mary Jane or Ned to figure out how to raise the baby while keeping it safe from harm.
Spider Man's character would grow in terms of his detective skills. Since Batman is a great detective, he would pass on some of those skills to Spider Man. This would make Spider Man not only rely on his spider - sense but also on his deductive reasoning when facing enemies. Also, he might become more secretive like Batman, which could change his relationships with his friends and family as they might not understand this new side of him.