How did you know it was your last baby?

Ra

I have 2 boys (1 & 3 years old). I always thought I would have 2 or 3. Being realistic 2 is probably us done as its easier with finances, childcare etc. However, I don't get that feeling of family is complete. I would love a little girl to complete family but I know theres no guarantees. When did you know you were done?