January 15, 2013 11:00 AM

Michael Simon/Startraks

Elizabeth Banks has hit official mom status.

Since welcoming her second son Magnus Mitchell in November, the actress — she and husband Max Handelman are also parents to son Felix — admits she’s feeling the full effects of motherhood.

“Two is very different from one. When you have one kid, you feel like you can jet set around and you can throw him on the hip and you get your life done,” Banks told PEOPLE at the launch of babyGap’s Peter Rabbit collection at Gap at The Grove in L.A. Saturday.

“You don’t realize how easy one is until you have two. Now I’m really a mom. Oh, I am a mom now! This is for serious — I am responsible for two people now.”

The reality of her new family of four finally hit home when Banks and Handelman decided to celebrate the holidays with their sons — sans hired help.

“[We] had no help, no nannies, no babysitters. It was crazy. You forget how difficult it is to wake up in the middle of the night, how exhausting it is,” she admits, adding being a hands-on mom took on a whole new meaning. “I lost all my nails. I did dishes and cleaned bottles for 10 days so I lost all those nails!”

Fortunately, making life easier has been Felix’s smooth transition into his role as the “sweetest” big brother. “He loves to say how cute Magnus is and he loves to give him kisses and he’s very gentle,” Banks, 38, shares.

“He loves to bring him gifts — sometimes that means shoes that are thrown in the bassinet, but that’s okay.”

The 22-month-old’s tough love tactics may be seemingly sweet now, but Banks isn’t holding out hope the brotherly bond will last long.

“I would say [Felix] is mostly unaware of what’s going on because Magnus doesn’t touch his stuff,” she explains. “I’ve heard that around 10 months — when baby can actually influence the realm of Felix — that Felix will not be happy. We’ll see how that goes.”

One thing that’s for sure? Banks and Handelman hit a home run when playing the name game.

“Felix means happy in Latin and he is very happy go lucky,” the proud mom says. “Magnus is definitely more serious. He’s going to be the deep thinker of the family for sure.”

— Anya Leon with reporting by Jennifer Garcia

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