Breastfeeding take two?

Has anyone been able to breastfeed their first baby, but not their second? Oh ace this fear in the back of my mind, that I won't produce milk or something. I breast fed my son until he was a little past a year old, never had any problems. Actually, I came home from the hospital with a big tote full of milk, I also had to wear breast pass the entire time. Milk machine. But! I also started leaking before he was even born. This time around, I haven't leaked yet. Maybe that's why I'm worried? Are my fears irrational?