The actress gave birth to a son named Samuel in February (12), and the tot joined sisters Violet, six, and Seraphina, three.
Garner recently confirmed she was ruling out another kid, and she now admits her offspring can be more than a handful most of the time.
She tells U.S. TV host Conan O'Brien, ""We wanted a third and we had a third, and I wouldn't trade him for anything. But, you know how two feels like six? Three just put me right over the edge.
""I was going up to anyone on the street saying, 'Would you please come work at my house? Would you please come help me? Just take a child. Do something.'""