People comparing my baby to my SIL’s baby

My sister in law also had a baby 3 weeks after I had mine. People keep comparing our kids saying mine is fussy and hers is super chill. They keep making me feel like I’ve done something to make him that way. I am breastfeeding him and they keep saying “oh well it’s probably something you’re eating that’s making him cry”. Well okay I’ve eliminated all dairy from my diet and I avoid foods that make me gassy so no it’s probably not that, maybe that’s just the way that he is and also not every child is going to be the same!!!

It’s rude!