AITAH for babysitting my sister's son to the best of my abilities and knowledge?
So! I am the oldest child but I do not have children! My brother and my sister both have had children within the past year. My brother lives close but my sister lives two states away. Anyway, My sister has a son, and we'll call him Jimmy(7 mo). We'll call my sister Emily. My brother has a daughter but they aren't very relevant outside of the fact that they exist.
So, Emily is a bit obsessed with numbers. She obsesses over her child's progress, to the point where she tries to enforce milestones on him early (like eating solid food before it was recommended) and she constantly asks the group chat why her son seems to be so frustrated during tummy time. But it's like she's training a baby athlete. And she makes it a point to bring up how much better her baby is doing in her eyes compared to my brother's daughter, who is three months older.
Emily and Jimmy came down to stay at my mom's during our youngest sister's wedding.
First impression of Jimmy was that he was a baby who could NOT be consoled! And Emily made it clear that he couldn't be. Every time he cried she would basically cry too and say she wished she didn't have him or that someone would take him, and then she would cover him with her own body and try to soothe him. She says he can only sleep for twenty minutes at a time and has severe intestinal distress and can only poop every three days.
After the wedding, Emily wanted to help our youngest sister clean up so I was asked to babysit Jimmy. I have plenty of experience babysitting my niece so I assured Emily that we'd be fine. She warned me and said "Okay but he might cry the entire time you know..." And I let her know I could handle it.
Reader... That baby did not cry. I have no idea what I did differently from my sister, Emily, but he smiled and giggled and played with me. I gave him his formula, changed his diaper, and laid him down for naps. He cried one time in the seven hour period I had him. He and I bonded so much that even though he can't really crawl he scooted over to me at one point and laid his head on my lap and fell asleep(to which I then promptly laid him in his travel crib so it wouldn't hurt his neck).
When my sister came back, apparently I did everything wrong.
I excitedly say, "Look, he drank three bottles and got halfway through a forth!" Emily then informs me that I shouldn't have allowed him to consume that much over the day. That it isn't healthy. She then asked me when the last time I fed him was because he seemed hungry. I had fed him thirty minutes prior.
I also changed his diaper twice. Once because it was needed and once for general sanitary reasons. She got angry with me and said I should've changed it every two hours. I apologized and told her I made the decision based off of personal research on the net and she told me she finally freed him of his diaper rash and now it was going to come back because of me.
She got upset that our mom didn't have a bottle warmer. Why would she have one???
The last thing that she got upset over was that I laid a towel out to change her son's diaper. She asked why I didn't just keep him on the blanket I left out, and I told her to prevent potential pee or poop getting on his makeshift playmat. And then she asked why I didn't just put him on the floor then and I told her because it would've been unsanitary and I know that's important to her. She then said that changing a diaper takes less than a minute and I should've just kept his legs from touching the floor. I told her that germs can still get on his clothing.
On top of that she didn't believe the story of him laying on me because it never happened to her and she doesn't believe that he didn't cry or that he took two 35 minute naps and one 1 hour nap. I think she's upset that her baby likes me but I got so angry that I just said I was tired and left. But honestly did I do wrong here? The baby seemed genuinely happy the whole time but maybe I was being too ignorant or something. What do y'all think?
Edit: I definitely hear y'all talking about my sister potentially having some ppd and it's actually something we've mentioned quietly among some family members. I'll have a heart to heart with her soon since this seems to be the potential issue. But thank y'all so far for your comments and advice