June 10, 2015 02:00 PM

Molly Sims has a serious gift that is sure to make all mothers jealous.

“I don’t know why, but I make calm babies,” the mom to Scarlett May, 11 weeks, and Brooks Alan, 3, tells PEOPLE. “She’s probably cried six times in her whole life! I don’t know how.”

But despite Scarlett’s calmness, Sims, 42, says expanding her family with her husband, producer Scott Stuber, 46, has made things “very busy.”

“Having two kids is definitely a game-changer,” says the author of The Everyday Supermodel.

Gia Canali

However, Sims admits she’s learned quite a few things the second time around. “I had much more trepidation with Brooks because I didn’t know what I was doing,” she explains.

“With her, it’s like, ‘Okay, you’re pooping, you’re eating, you’re drinking — we’re good!’ In that way, it’s been really good.”

Plus, having another girl in the family has given Sims a new appreciation for cute baby clothes.

“I always thought I was a boy mom, but I have never had so much fun dressing anyone in my life!” she says. “I’ve become the cliché I didn’t think I’d become. It’s like, ‘What do you want to wear today? Pink or hot pink?’ “

Big brother Brooks is also loving life with his baby sister, who “just started smiling.”

“We were FaceTiming with them the other day and he said, ‘I need to see baby sister!’ ” shares Sims. “He loves her.”

— Ana Calderone with reporting by Aili Nahas

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