Kate Middleton may have dropped a hint that Prince Louis is already walking.
On April 23, Kensington Palace released adorable pictures to mark his first birthday, taken by Kate herself who is a keen photographer.
And on an outing this week, the Duchess of Cambridge revealed her and Prince William's third child is 'keeping them on their toes'.
She told how he'd recently managed to get himself up on the top of a slide - which could mean he is walking.
Kate spoke about her youngest son's antics during a visit to Bletchley Park to view a special exhibition marking the 75th anniversary of the D-Day landings yesterday.
While chatting to royal fans, she revealed: "Louis is keeping us on our toes.
"I turned around the other day and he was at the top of the slide - I had no idea!"
Kate Middleton recycles £1,750 dress at Bletchley Park where grandma was WWII codebreaker
Kate, 37, Kate Middleton recycles £1,750 dress at Bletchley Park where grandma was WWII codebreaker for the Bletchley Park visit.
She previously wore the classy frock in the official photographs marking the Prince of Wales' 70th birthday last year.
The historic Bletchley Park Teleprinter Building was where Codebreakers received hundreds of thousands of enemy messages, intercepted at secret listening posts across the UK, throughout the Second World War.
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Kate's own grandmother was among the clever Codebreakers who deciphered Nazi secrets when the work going on behind the mansion's closed doors was one of Britain's most closely-guarded secrets.
During the visit this week, Kate met with veteran Codebreakers who worked at Bletchley alongside her own grandmother Valerie Glassborow, and her twin sister Mary, during the Second World War.
She also viewed the interactive exhibition and met with those who worked together to deliver the restoration of the building.
Kate then met schoolchildren taking part in one of Bletchley Park Trust’s learning activities.
