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High single digit improvement for an increase from a breastfeeding duration of one month to several months was found in a study referenced in this review (other parts of the review reference benefits including protection against SIDS and ADHD):

https://cybermedlife.eu/attachments/article/5212/The%20benef...

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This study doesn't even show the sample sizes for each referenced study. Take it with a pinch of salt.

Because the benefits of breastfeeding are already extremely well documented in the literature.

Thanks for answering the question and linking to the study.

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