April 10, 2015 07:00 PM

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Many babies take their first steps to reach a toy or a favorite snack, but Sid, the son of Jason Biggs and his actress-author wife, Jenny Mollen, had a different motivation.

“Jenny was in the bathroom and Sid had the toilet paper,” Biggs, 36, tells PEOPLE. “She was like, ‘Come here, I need that,’ so he took two steps towards her. It was very funny. Very appropriate.”

Biggs, who with his family transplanted from Los Angeles to New York to star in The Heidi Chronicles on Broadway, says frigid East Coast weather put a crimp in Sid’s first birthday plan in February.

“The day of his birthday was one of the coldest days of the year,” says Biggs. “We took him out to brunch and it was brutal! So we went back to the apartment and we had ball pits and balloons and Elmo. It was a ball party.”

Now that his son is entering the toddler stage, Biggs says Sid is busier than ever. “He is getting into cars. And he has a ducky with wings that flap that he loves,” he says. “But his favorite toys end up being a coffee cup that he pulled from recycling. Or an empty Perrier bottle.”

Reading is an important part of their routine as well, says Biggs, who is a longtime supporter of Milk + Bookies, a charitable organization that provides books to children who need them.

“Reading was part of his bedtime routine from the very beginning,” says Biggs. “I’m excited to get Sid involved and have some Milk + Bookies parties too.”

As far as Sid’s literary favorites? “He loves The Very Hungry Caterpillar,” says the first-time father.

“And,” he says jokingly, “the screenplay for American Pie. That’s pretty much all he reads.”

Milk + Bookies’s Sixth Annual Story Time Celebration takes place Sunday, April 19.

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— Aili Nahas

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