October 05, 2011 06:00 AM

When Jessica Alba and Cash Warren welcomed their daughter Haven Garner on Aug. 13, the couple thought they had a pretty good idea of what was to come.

“I really only expected my child to look like Honor,” Alba, referring to her and Warren’s 3-year-old daughter, tells PEOPLE. “When the two of us made such a different-looking kid it was, like, ‘Okay, I guess we can do this too!’ It was a nice little surprise.”

Adjusting to family life as a foursome has been full of unexpected but very welcome surprises.

“She just started smiling,” says Alba, 30. “[The other] morning Cash was talking in her ear, whispering and kissing her and she was smiling the whole time. It’s an amazing connection.”

But seeing Warren, 32, with their new addition may be her most memorable moment yet.

“It was that first love tingle you get when you’re prickly all over and your heart is beating so fast that you can’t take a deep breath,” she says.

For Alba’s at-home family album and more on her life as a mom, pick up the new issue of PEOPLE, on newsstands Friday

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