Broody

Ok, why is it that although i always state "I don't want kids" whenever someone has a baby i get all broody, i'm a guy i'm not supposed to get broody, but my bros just had a little girl and shes just so damn adorable, now i want one lol. I'm sure this feeling will pass... at some point, i mean i'm in no rush i've got all the time in the world right? Either way the latest addition to my family is by far the cutest...