February 08, 2015 01:00 PM

Molly Sims is all for celebrating her child’s birthday, but she’s determined to teach her son Brooks Alan that the gift of giving is half the fun.

“Santa Claus came. Birthdays come. We pick out our toys that we want and then we give half of them to Baby2Baby,” the model and actress, 41, told PEOPLE while donating school supplies to Children’s Hospital Los Angeles with the help of Yoobi and Starlight Children’s Foundation on Wednesday.

“When he goes and drops it [off] it’s hard for a 2½-year-old to give up a Transformer, but we do it because you have to teach them young.”

Brooks will soon be getting the biggest gift of all: Sims and her husband Scott Stuber are expecting their second child — a girl! — in March.

“He told me yesterday that he had a baby in his belly,” says The Everyday Supermodel author. “I was walking down the stairs a couple of days ago and he goes, ‘Mama has a big belly’ and I’m like, ‘Yes, she does.'”

Mike Windle/Getty

Although Sims has already been showered with love — her friends recently hosted a get-together to honor the mom-to-be — her daughter’s nursery is still a work in progress.

“We’re moving so that’s been a little bit of a hiccup, but I have some things planned,” she says. “I called my husband and I was like, ‘I found a hot pink star blanket,’ like I’m so superstitious … I bought it, but it’s hidden in the corner. I have all of her stuff hidden.”

But finishing baby girl’s sleep space isn’t the only thing on the couple’s to-do list. After putting together a PowerPoint presentation of baby names while Sims was pregnant with their son, Stuber is taking the same approach to deciding on his daughter’s moniker.

“He’s putting one together with our top three names [and] our top three middle names. He is addicted,” Sims jokes. “[He says,] ‘We really got to focus on the name, we really got to focus.’ I’m like, ‘We’re fine. We have a good idea.’ And he goes, ‘I’m telling you. I just think we need to focus.'”

And while she once considered herself a mom of boys, Sims is ecstatic to welcome a baby girl to the family.

“I think you always dream of having one of each,” she says. “I’m so close with my mom. I’m so happy. I can’t wait to meet [my daughter]. We saw her on Monday and she’s a chunky monkey already.”

Mike Windle/Getty

— Anya Leon with reporting by Mariah Haas

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