I think yes and no, umm babies are susceptible to infections so you should use a very sterilize needle to pierce it, also after that you must sterilize the wound while taking care of it (afterall a open wound is very risky for a baby specially in the case of ear piercing where I saw people who...
well same here bruh, I'm also an aspiring author and this is one of my problems....so you should try to put the main events for the story to a notepad....as for the characters try putting their attitude, personality, views and mindset to the notepad...then imagine yourself being the mc, what...
welp, 1 mc would be fine, also some of the events that happen in that specific world should be altered (afterall mc will be a great variable with his system, he would create a great butterfly effect in the upcoming events) an example for that would be like if in naruto....the mc saved kushina...
would be good if it's a system fanfiction that changes worlds so that it has lots of way to improve.....anime world, movie world or whateva even light novels world would be included