Pippa Middletonis passing her passion for sports onto her son!

The younger sister ofKate Middletonopened up about being a mother to6-month-old Arthurfor the first time in U.K. supermarket monthlyWaitrose Kitchenmagazine. After previously sharing howswimming helped her stay fit during pregnancy, Pippa revealed that Arthur is already loving the water.

“Starting my son Arthur swimming at four months old has given him confidence and enjoyment in water,” she wrote, according to the Instagram fan pageMiddletonMaven. “He’s now six months old, and swimming is one of our favorite activities. The exercise helps guarantee sound daytime sleeps, and the movement has improved his digestion.”

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Pippa Middleton in February.The Image Direct

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Pippa, 35, previously said swimming had become a go-to way to keep up her fitness routine as she neared her due date.

“From personal experience, I’d confidently say I find it has been the most enjoyable and rewarding form of exercise since I found out I was expecting,” she shared. “It’s comforting to know that it’s safe throughout pregnancy, and you don’t need to adapt and change too much (unlike most other sports). It’s so good for you that you could swim every day – as long as you don’t overexert yourself – right up until the end of the third trimester.”

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Asource previously told PEOPLEthat Pippa and James are looking forward to settling down and “having children and leading a quiet life.”

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Of course, soonPrince George,Princess CharlotteandPrince Louiswill have another cousin as a playmate:Meghan MarkleandPrince Harryare expected to welcome their first child in the coming weeks.

source: people.com