Hmm...this one was kind of hard. Obviously the birth of all 4 of my children were extremely happy days in my life. Really in the end, it came down to the birth of my oldest son, because that is the day I became a mommy for the very first time, and the day I married my husband.
In the end, I have to go with the day that I married my husband. I just can't place the birth of one child higher then the birth of another, they all made me very happy.