You can't tell causation from this I was.
I was FF due to PND in the late 70's which had less support. Dsis is 6 years older and was fully BF. I have no allergies. I am intelligent, educated and have achieved far more academically than she has. I have more stable mental health (by a long shot) than she does. The only illnesses I have had are very clearly genetic ( on the grounds it hits several times in each generation and follows a pattern to an absolute tee....has never missed ).
Dsis has food issues, mental health concerns and a serious attachment issue with basically anyone. She has asthma and eczema and persistent other hormonal issues.
It's got jackshit to do with how we were fed 40 odd years ago. She has mental health issues because she couldn't escape a toxic situation and I could. I got lucky that's all.
She has food issues because of the same batshit toxic environment she has to live in...again I got out. It had everything to do with our opportunities in our 20's.
She has eczema because she gets it from my DF who suffers from it horrendously and I got his nose. She has asthma because between the age of 17 and 25 she smoked three warehouse fulls of Benson and hedges and experimented with every smoke able drug between here and the heights of Nepal.
I don't think I'm happy , healthy and intelligent because I was formula fed. I am happy healthy and intelligent because I was brought up with the belief that reading and enquiry was a good thing. I am happy and healthy because I got the opportunity to escape toxicity and I ran like my ass was on fire.
None of it has anything whatsoever to do with my feeding
For good measure DS1 was BF for longer than Ds2 and is ASD (a crystal clear line on boys in my family for about 6 generations showing ASD traits ....the last two diagnosed and two in DS1 generation...both first born boys....fairly clear its not related to feeding choices). Neither Dc has any allergies. Both eat me out of house and home and are exactly the right weight for the height. If it's relevant they would both sell me in return for a punnet of strawberries and I'm fairly sure Ds2 would trade my kidney for chocolate but thinks that apples are heaven sent. No asthma. No eczema and if there was ever any doubt about their intelligence one only has to look at the famous jelly bean heist of 2018 to have no further doubts on that score.
I believe in natural , I believe in fed is best more. I believe that its a total fallacy to convince yourself you can protect from life by your feeding choice and I bloody hate the BF v FF debate because I have seen more new mothers cry over that guilt than anything else.