MIL trying to tell me it’s not normal

That my 9 month old doesn’t poop every day. Baby doesn’t seem distressed at all about it (besides 1 time when she was constipated but that resolved itself quickly).. she never has issues when she’s going.

I told her it’s super common and normal esp after starting solids. She told me she has never heard of a baby not pooping every day at least once and it’s usually multiple times

I get the sense she thinks I’m doing something wrong bc my first actually did have constipation issues bc she would hold it in for days on purpose. I am very conscious of food choices I give them esp when it’s been a couple days and have prunes handy, etc. done so much research and talked with drs so many times about it. MIL has questioned me about foods I’m giving my babies (brown bananas when my first was young, she said they’re constipating and I shouldn’t.. but I know that’s only when they’re on the greener side and it’s did when brown. Just an example of several times like this). Just feels like to me she doesn’t really know fully what she’s talking about. Am I right?

Also she is breastfed and this has been her normal