Royal baby fever: see the Queen, Prince William and other royals aged one

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April is an exciting month for the royal family. Not only could we see the arrival of the Duke and Duchess of Sussex's first child, but Prince Louis celebrates his first birthday on 23 April. As the third child of the Duke and Duchess of Cambridge, Louis is fifth-in-line to the throne, following his siblings Prince George, five, and Charlotte, three.

A spokesperson for Kensington Palace revealed to HELLO! that the family will spend the day privately, celebrating Louis' first birthday with the people that matter most. We can expect to see an official first birthday portrait released by the palace to commemorate the big day. Scroll through to see what the rest of the royals looked like when they were Louis' age...

Prince George

It feels like only yesterday that Prince George was learning how to walk!

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Mia Tindall

Mia Tindall, Zara Tindall's eldest daughter with retired rugby player Mike Tindall, has inherited her parents' love of outdoor activities, wrapping up warm in a purple fleece onesie while attending an equestrian event in 2015.

MORE: Sarah Ferguson joins Prince Andrew and Princess Beatrice at Grand Prix

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Peter Phillips

Wearing a smart military-style peacoat, a young Peter Phillips looks every inch the royal aged one and a half.

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Prince Andrew

Born in 1960, Prince Andrew was the first royal born to a monarch since 1837, after his mother the Queen took to the throne in 1953. Attending the annual Trooping the Colour ceremony in 1961, Andrew made his public debut at 16 months old.

Keep clicking to see more photos.

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Isla Phillips

The youngest daughter of Peter and Autumn Phillips, Isla celebrated her seventh birthday on 29 May. When she was just one, the royal was often spotted out at events with her parents, looking cute here (left) in a woollen hat alongside sister Savannah.

MORE: Why signs suggest Harry and Meghan's royal baby will be a girl called Diana

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Prince Harry

As a young boy, Harry was every bit the playful prince he is now. The red-haired tot was often seen playing with his older brother William, tinkling the ivories whenever he got the chance.

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Prince Charles

He may have celebrated his 70th birthday in November, but Prince Charles was once a grumpy toddler like the rest of us!

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Prince Edward

As a one year old, Prince Edward loved playing with his older brother Prince Andrew. With only four years between them, the pair were closer than they were with their older siblings, with Princess Anne being born 14 years before Edward.

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Prince Philip

It may be hard to recognise this one year old as Prince Phillip, but back on a family holiday in Corfu in 1922, the Prince Consort sunned his white blonde hair in the warm weather.

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Princess Anne

The only daughter of the Queen, Princess Anne is seen here as an adorable baby spending some time with her grandparents, King George and the Queen Mother, as well as her three-year-old brother Charles.

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Princess Beatrice

A style icon from day one, Princess Eugenie matched her mother Sarah Ferguson with her red hair and stripy outfit on a public outing at Ascot in 1986.

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Princess Charlotte

Another fan of matching mother and daughter clothing, Princess Charlotte complimented her mother in stunning blush pink while attending Pippa Middleton's wedding to James Matthews in 2017.

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Princess Eugenie

Princess Eugenie made for one very sweet baby, rocking a pair of red booties and holding a silver balloon at a family outing.

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Prince William

As an adorable baby, the young Prince William was close to both of his parents. With his blonde hair, however, the Prince was the spitting image of his mother, the late Princess Diana.

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Savannah Phillips

Sporting a summery look with a pink hat and gingham shirt, Savannah Phillips looked as cute as a button while enjoying an ice cream with doting aunt Zara Phillips.

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The Queen

In 1927, a baby Princess Elizabeth smiled for the cameras, unaware that she would become the country's longest reigning monarch.

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James, Viscount Severn

The youngest child of Prince Edward, James may be on the verge of his teenage years, but the royal was once a sporty tot enjoying a day out with his family.