I'm rather spiteful myself but I would definitely feel the need to defend myself here - mama bear style. I would reply all (yes, all) with your son's medical records indicating his growth is normal, he's reaching milestones, etc. As previous posters have said, you'll probably want this info handy for your ex and possibly CPS too.
Then I would also include a link to the snarkiest article I could find online about backseat parenting and/or overeating and obesity in children caused by parents overfeeding.
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