I know I'm being sensitive but...

I just want to figure things out on my own. And I just feel more comfortable with doing what doctors tell me. But my boyfriend keeps talking to his bil and sister and keeps saying what they do, so we should do the same thing since their great parents. Which they are really good parents, and what they do isn't wrong because obviously their kids are just fine. But idk he says he's just giving me suggestions but the way he says it to me is like I don't know what I'm doing, or not being a good Mom about it. And like we just need to do it their way even though he says we can do it whatever way I want. Like he gets mad at me about it is what it seems like to me. Idk I just get too upset about it, but I just don't like suggestions or advice from other parents unless I ask. I just like to go by what doctors tell me to do, and what I know from what I learned in my lifetime of taking care of kids of any age, what I read up on, and just my maternal instinct. Sorry just venting, I'm just upset and because we just got in a big argument about it because he's mad he gives me suggestions and I don't care for it, and he just took off after arguing with me about it.