03/08/2026
Some claims get a lot of airplay because they appeal to the masses. Good research is often more boring (aka less newsworthy) but more accurate…
Your Milk Isn't "Boy Milk" or "Girl Milk"
Our study has shown there is in macronutrients based on your 's *x.
We analysed milk from 161 mother-infant pairs from Denmark and Australia, measuring protein, lactose, fat, and energy. In the Australian infants, actual 24-hour milk intake was measured.
The result: across both countries, there were in milk composition or in how much milk, protein, fat, lactose, or energy babies took in over 24 hours, whether they were boys or girls.
This challenges the idea, partly inspired by studies in animals like macaques, that mothers unconsciously change composition according to whether they are a girl or boy. Our , including this study, doesn't back that up. Many other things impact milk macronutrients composition like the time after birth and time of day, not your baby's s*x.
So, if you've worried your milk isn't "tailored enough" for your son or daughter specifically, you can let that go. In terms of macronutrients and energy it's built for babies, not "boy babies" or "girl babies."
Source: Honoré et al., Nutrients 2025, 17, 3647.
https://www.mdpi.com/2072-6643/17/23/3647