Katherine Schwarzenegger Shares Back-to-School Tips as She Posts Sweet Photo of Her Daughters

The best-selling author is currently expecting her third baby with husband Chris Pratt

<p>Michael Kovac/Getty; Katherine Schwarzenegger/Instagram</p> Katherine Schwarzenegger (left); Eloise and Lyla

Michael Kovac/Getty; Katherine Schwarzenegger/Instagram

Katherine Schwarzenegger (left); Eloise and Lyla

Katherine Schwarzenegger Pratt's daughters are headed back to school!

On Monday, Aug. 19, the Good Night, Sister author, 34, shared a few photos on her Instagram as she announced that her daughters Lyla Maria, 4, and Eloise Christina, 2, are heading back to the classroom. In one sweet photo, the two girls stand side-by-side wearing matching sparkly pink backpacks with their names printed on the back.

"How is it already back to school time?!" Schwarzenegger Pratt lamented in her caption. "Here's what we're doing to help get the kids back into a routine."

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Related: Pregnant Katherine Schwarzenegger 'Can't Believe' Daughter Lyla Is Getting Older as She Celebrates 4th Birthday

"Start early — the best way to transition into a back-to-school routine is to start soon not the week they go back to school," she wrote. "Adjust the bedtime or naptime (if you’re lucky with still doing naps) — we’ve been gradually moving bedtime back 15–20 minutes each night until they’re back on a school sleep schedule. We all loose the schedules a bit in summer."

The mom of two, who is currently pregnant with her third baby with husband Chris Pratt, 45, went on to say that she doesn't allow screen time before bed, instead opting for family reading time, drawing or playing with a small toy.

Related: Chris Pratt Shares Sweet Pic of Pregnant Wife Katherine Schwarzenegger: 'Greatest Party Planner in History!'

At the end of June, a source confirmed to PEOPLE that Schwarzenegger Pratt is expecting the couple's third baby. Pratt is also dad to son Jack, 12, whom he shares with his ex-wife, Anna Faris.

Earlier in August, Schwarzenegger Pratt shared a photo on her Instagram Stories as she decorated her house for her daughter Lyla Maria's fourth birthday. The proud mom posted a picture of their living room, which included a fireplace and a hanging TV.

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In between the two fixtures, the mom of two hung a "Happy Birthday" rainbow sign. "My little girl is 4 and I can't believe it," she wrote across the picture.

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