I was a full blown diabetic, as my diagnostic Hba1c was 91.
I had two babies - quite some time ago now, both over 9lb at birth but I have always, from my early 20s needed to eat low carb to stop weight gain.
My doctor almost had a fit when he found out that I had gone all through my first pregnancy low carbing and was past the second tri of my second baby - threatened me with hospital to be 'fed properly' if I did not follow the diet sheet - almost killed me. I had pre-eclampsia and it was only because there was no bed available that I had to go back after the weekend - I dropped all the cereal bread and potatoes from my meals and lied to him about why I felt better and my symptoms were reduced. I am sure that for some people the modern diet is just wrong. I eat 40 to 50gm of carbs a day and I am better than fine. At the age of 66 I am thinking of going back to teaching, because I am ignoring medical advice, once again, and not eating the 'cholesterol lowering' high starch foods. My diet is the same now as for whenever I could get away with it, which I did manage for decades.
I avoid processed foods, in the main, eat lots of fresh veges, modest amounts of low carb fruit, Lidl protein rolls are my only 'bread' and I have maybe 4 in a week. no grain, no potatoes - it is not us that are wrong, it is the diet, I am sure of it, and if I'd been tested years ago I'd have shown some signs of wrong-ness. I used to get symptoms of hypoglycemia in my early 20s, so something has been not right for a long time.
By eating fewer carbs hopefully your pp readings will not spike so high - some rise is to be expected and is normal - but it does look as though your insulin reaction is slow - and if you continue to have high readings, things are not going to get better.
I breast fed on low carb foods - my firstborn was always in the top 10 percentile - he's about a foot taller than me, so I don't think that he was lacking anything.