June 18, 2014 03:00 PM

He made a name for himself with cringe-inducing scenes in American Pie and now that Jason Biggs is a dad, he’s discovering some real-life scenarios that can be just as sticky.

Like diaper changing, for example. “This little baby can pee a full stream,” Biggs, 36, tells PEOPLE of 4-month-old son Sid.

Adds his wife, actress and author Jenny Mollen: “You have to use something to cover it. It’s like a fountain. Sid will pee in his own face.”

And then there’s the couple’s tendency to share personal moments on social media (think breastfeeding and post-delivery placenta shots). “I’ve always posted stuff and gotten in trouble,” jokes Biggs. “This is my kid. Don’t tell me what’s wrong!”

Roger Davies

Echoes Mollen, whose new collection of essays, I Like You Just the Way I Am, hit bookstores Tuesday: “There are moments I wish I didn’t put as much out there. But I don’t know how not to share.”

One thing is for certain — Mom and Dad couldn’t be prouder of their bundle of joy. “I was overcome [meeting Sid for the first time],” says the Orange Is the New Black star. “It was emotional. I cried!”

Adds Mollen, 35: “The minute I had Sid, all I wanted to do was be with him. It’s weird to think about the fact that one day he’s not going to want to live with me.”

For more from Biggs and Mollen, including why they credit couples therapy for their strong marriage and how an earlier miscarriage drew them closer, pick up the newest issue of PEOPLE, on newsstands Friday.

— Aili Nahas

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