See Drew Barrymore's New Daughter Frankie!
05/24/2014 AT 10:40 AM EDT
"We were cracking up. It was hysterical."
The star wouldn't have it any other way.
Less than three weeks after giving birth to Frankie, her second daughter with her art-adviser husband, Will Kopelman, 36, Barrymore, 39, was back at work promoting her new comedy with Adam Sandler, Blended, despite sleepless nights and toddler-chasing days.
"I have no brain capacity to do anything right now!" she jokes, stifling one of several inadvertent yawns as she talks about the joy she's found as a mom.
"But I have my heart. And I can love my kids like nobody's business."