's family has been in the midst of a steady growth spurt for the past six years. But with the May 7th birth
of their third child, Anniston Kae
, the Grey's Anatomy
star and her husband, actor Nathan West
, have found that parenting gets a little bit easier with each addition to their clan.
"Going from zero to one is a huge shock," Chyler, 27, tells PEOPLE. "One to two was a little more challenging. Two