According to Sugar, you need to grow up.

We’re at the Target the other day, walking past the baby aisle and my four year old says to me, ‘Mom, I’d like to have another little baby at our house." 

To which I replied, "Well, what do you think has to happen to get a little baby at our house?" 

"You need to grow up."

Looking at it now, she was probably talking about herself, but it sounded a lot like, "Mom, you need to grow up.  Get real.  Just do it.  Get a hold of yourself and procreate."

And that’s all. 

UPDATE:  Engineer today told me he was going to wish really hard that Heavenly Father sends another kid to our family.