Tiffani Thiessen Is 'Sad' the Baby Stage Is Over (August 21, 2013)

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They say growing up is hard to do. But when it comes to kids, White Collar's Tiffani Thiessen thinks it's even harder on the parents.

"There's nothing baby about that kid anymore — which is hard!" Thiessen told PEOPLE of her 3-year-old preschooler Harper Renn at Disney Junior's Doc McStuffins interactive Doc Mobile visit on Wednesday in New York City.

"It's sad at the same time because the baby stage is definitely over."

While her daughter skipped the infamous terrible twos, Thiessen, 39, says, "She's definitely hit the independent stage: she's a rumble-tumble. She loves putting bows on, but she loves to climb." Keep up with your favorite celebs in the pages of PEOPLE Magazine by subscribing now.

The most surprising thing little Harper's doing all by herself: water sports. "She's fully swimming across our pool! No floaties, no nothing — it's crazy," Thiessen says, adding she or actor husband Brady Smith are always on hand with a watchful eye.

As for Harper's go-to swimming hole? Aside from their own pool, "We were just in the Hamptons. She loves the beach," Thiessen shares.