Is it normal that i let a coin decide what type of child i'll want?

Since I'm single and currently don't have any children, I just did a little experiment with a coin. I told myself that tails was a biological child and heads was an adopted child (Which ever got 20 would be the choice I make). The results were:
18 for Bio Child
and
20 for Adopted Child

So I'll be adopting in the future. is it normal that I'd let a coin determine what my future child will be? I don't want multiple kids and since I wanted a biological and adopted child equally, I let the coin choose (and either result was fine with me. No complaints). I thought it was a clever thing to do and I wish more people would do the same (But I don't condemn those who don't).