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Catherine Duchess of Cambridge, Kate Middleton, Prince George

© i-Images, PacificCoastNews.

Kate Middleton is making sure she gets plenty of alone time with her firstborn before Prince George's little sibling arrives next month.

The pregnant royal took her 20-month-old son to London's Science Museum on Thursday for a private outing, the pair making the short drive from Kensington Palace in the morning.

According to People, the museum was closed to other visitors while the royals and their personal security detail were there.

Kate and George reportedly spent most of their time playing in the Pattern Pod, a hands-on gallery created for younger children to explore multi-sensory exhibits about plants, shapes, animals and other kid-friendly subjects with their parents.

"They seemed to enjoy themselves. It's lovely that she feels she can bring George here," a source told the mag.

Meanwhile, according to a volunteer at the Brookhill Children's Centre who chatted with the Duchess of Cambridge during her visit earlier this week, Kate revealed that her due date is "mid to late April."

We of course don't know, just as we didn't the first time, whether Kate and Prince William are expecting a girl or another boy—but you can bet that it's going to be another waiting-game extravaganza as the birth approaches.

U.K. betting house Ladbrokes put on the Barkingham Palace Gold Cup—a Welsh Corgi race to determine which baby name (male or female) is the favorite—just yesterday.

Watch right here and see which adorable pup placed first!