Praising her son Sebastian as "growing in light years," America Ferrera tells PEOPLE for this week's issue, "It's like every day he does something new"

By Maria Pasquini and Christina Dugan
March 29, 2019 12:40 PM

Motherhood is one exhilarating (and sometimes terrifying) experience.

America Ferrera couldn’t be prouder of how fast her 10-month-old son Sebastian “Baz” Piers is growing — but not every milestone her baby boy reaches is without its complications.

“A lot of my moments of pride have to do with my little guy now,” Ferrera, who welcomed her first child with husband Ryan Piers Williams in May, tells PEOPLE in this week’s issue, out now.

Praising her son as “growing in light years,” the 34-year-old Superstore actress shares, “It’s like every day he does something new.”

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Detailing one of Baz’s recent accomplishments, Ferrera explains that one day she walked “into his nursery after a nap and he had pulled himself up on his crib and he was standing there.”

“I was at once so ecstatic and also horrified that our life was about to get a lot more complicated now that he can pull himself out of his crib,” she says.

Credit: Trae Patton/NBC/Getty

The How to Train Your Dragon: The Hidden World voice actress tells PEOPLE there are “a million little things” her son does that make her laugh, like “the way he grunts … and makes a lot of effort noises.”

“It just seems like he’s lifting 1,000 lbs. of weight and he’s so committed to it, he’s so focused,” Ferrera explains. “He will not give up, which I love. It makes me proud, but also the little noises that come out of his body when he’s pulling himself up are pretty funny.”

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“I’m a junkie for his laughter” too, she adds of the youngster, admitting she has resorted to some pretty hilarious actions to elicit a giggle from her baby boy.

“I get down on the ground and make funny faces and now my monkey noises are a real fan favorite with Baz, so I’m doing them pretty often,” the actress reveals. “The monkey noises … make me feel quite juvenile, in the best way.”

For more of a glimpse into America Ferrera’s life as a new mom, pick up the latest issue of PEOPLE, on newsstands now.