We've got 3 kids. A good number.
The only problem is, you are ounumbered by the enemy. There are more of them than there are of you. Learn to juggle.
I also found that after child #3, I ceased being endlessly patient. In order to prevent an all-consuming outbreak of chaos from breaking out, you learn to run a tight ship. I'll have a discussion, explain myself, listen to their side, tolerate a little foolishness, but then we're done. And when I say done, I mean D-O-N-E.
Pay attention to the open sky