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Sources:
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https://www.ncbi.nlm.nih.gov/pubmed/10785345
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http://www.slate.com/articles/health_and_science/medical_examiner/2007/06/stretch_marks_for_dads.html
http://time.com/116843/gay-dads-brains-develop-just-like-those-of-straight-parents-study-finds/
https://www.technologynetworks.com/neuroscience/news/the-brains-gray-matter-increases-and-then-decreases-in-volume-during-learning-294533
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4970346/
https://www.ncbi.nlm.nih.gov/pubmed/11015620 http://www.yourhormones.info/hormones/prolactin/
https://www.sciencedirect.com/science/article/pii/S0018506X03001703
https://www.nature.com/articles/nn.4458
Image Source:
https://en.wikipedia.org/wiki/Testosterone#/media/File:Testosteron.svg