The literature is unclear
More likely for it to be a positive effect, why should it harm brain development
I'd bet >80% chance there's a small positive effect
Now the real question is how long should you feed your kid.
If formula is better
Could the effect be mediated?
If the mother has a lot of contaminants in her breastmilk, or is nutrient deficient, formula might ne superior. Absent those, breastfeeding probably is.
More likely for it to be a positive effect, why should it harm brain development
I'd bet >80% chance there's a small positive effect
Now the real question is how long should you feed your kid.
If formula is better
Could the effect be mediated?
If the mother has a lot of contaminants in her breastmilk, or is nutrient deficient, formula might ne superior. Absent those, breastfeeding probably is.