I (25F) and my husband (25M) have a 9-month-old baby. From the start, we’ve asked everyone to not visit or be around our baby if they’re sick, even if it’s just a cold, because we don’t want him exposed to anything. Last weekend, my mother-in-law (MIL) dropped by to bring some toys for the baby. She mentioned she was sick so she would stay outside and had my husband get the toys from her. I appreciated that she respected our rule to stay away when sick. The next day, we went over to my brother-in-law’s (BIL) house for dinner, and my MIL showed up. She was still clearly sick (sounded congested, etc.), but I didn’t want to make a big deal out of it as long as she didn’t come close to the baby. However, she tried to come up with her arms out for the baby. I politely held out my hand and said, “If you are sick, please don’t come close to the baby. I don’t want him getting sick.” She got very upset and claimed she wasn’t sick because she didn’t have a fever. She then went to sit as far away as possible, but at that point, my husband and I decided it was best to leave. A few days later, our baby ended up getting sick. We didn’t accuse MIL of causing it, but we just wanted to remind her of our rule. My husband texted her and explained it again, but she blew up. She said I was disrespectful and treated her like she had the plague. She insisted that she wasn’t sick because she didn’t have a fever. She then claimed we must think she’s “inconsiderate” and “selfish” if we think she would ever come around running a fever. We have tried explaining multiple times that just because you don’t have a fever doesn’t mean you aren’t sick. She also said we must think she is incompetent even though she raised three children herself and said that I probably won’t even let the baby play with the toys she got him because they are from her. My husband told her that I didn’t do anything wrong and that she was making it a bigger deal than it needed to be, but I’m still wondering if I overreacted by holding my hand out and saying what I did. So, AITA for telling her not to come close to the baby?