https://www.healthline.com/health/food-nutrition/is-there-a-soy-milk-estrogen-connection#benefits

soy isoflavones act similarly to estrogen within the body

It’s not entirely unfounded. but the effect is pretty low.

however: https://pubmed.ncbi.nlm.nih.gov/19496976/

Results: After the intake of cow milk, serum estrone (E1) and progesterone concentrations significantly increased, and serum luteinizing hormone, follicle-stimulating hormone and testosterone significantly decreased in men. Urine concentrations of E1, estradiol, estriol and pregnanediol significantly increased in all adults and children. In four out of five women, ovulation occurred during the milk intake, and the timing of ovulation was similar among the three menstrual cycles.

cow’s milk does absolutely mess with prepubescent kids bodies