Aggravating grandparents

We are first time parents and our son is 1 month old. We are now quite comfortable with our baby, and can now tell what all his different cries and cues mean. I even took as many baby classes as I could, as well as both of us doing some reading before baby arrived. We've been lucky enough (and are super grateful) to have his grandparents visit and help us during this time of sleep deprivation. BUT... we were so ready for my husband's parents to leave, and 3 days into my mom's 7 day stay, we're ready for my mom to leave, and I'm frustrated and want to cry. Our son spent some time in the NICU when he was born due to some breathing problems among other things. I had to tell my MIL to put my baby on his back when I caught her putting him to sleep on his stomach. Now my mom insists on putting my baby to sleep on his stomach with loose blankets and says, "I put you to sleep on your stomach when you were a baby, and you turned out fine". SIDs was unheard of 30 years ago, and I tried to explain it to my mom, but she won't listen. I've had to deal with them not believing me when I insist that I know why my baby is crying, but it's like they don't believe me and we have to go through 20 min of figuring out why he's crying when they're holding him, only to find that I was right all along. One time, my husband was trying to show me something in his parenting book, and his mom made the smartass comment, "we raised you without a book". I was so livid! I know we're first time parents, but it's a slap in the face when they won't trust us with our baby. I've been having a really stressful and emotional time with breasfeeding also, and they haven't really been understanding about what a hard time I'm having. They question why we do specific things that our pediatritian told us to do. I'm so frustrated, please tell me I'm not the only one dealing with this!