I have been researching the affects of having kids on men such as ppnd and came across a lot of research that talks about a decrease in testosterone in men after their children are born. My partner has 2 kids and used to be very skinny not a lot of muscle tone, couldn't grow a beard and had almost no body hair howver after his first kid was born he suddenly gained a lot of muscle tone without exercise grew in a rather thick beard very quickly and gained a lot of chest hair which are opposite affects of decreased testosterone his hair also went from light blonde to dark brown however I do not know if that is linked (mine has done it over time but his did it within weeks) but I have not been able to find any research on this or any cases of increase in testosterone and was wondering if it is just uncommon or it doesnt happen and his affects were related to something else