Garner, 40, who raises Violet, six, Seraphina, three and six-month-old son Samuel with husband Ben Affleck, said she is happy to stop expanding her family, reported Showbizspy.
"No I definitely, I plan to be done. But my husband is kind of a wonder sperm kind of guy," she said.
Garner said Affleck is very good at playing with his young daughters.
"You know his girls are so into him. He kind of excels at playing baby doll!" she said.