Kate Middleton will arrange a special birthday for Prince William, according to an expert (Image: Getty Images)

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Kate Middleton will likely "pull out all the stops" to ensure Prince William feels appreciated on his birthday after a tough year for him and the Royal Family, an expert has said.

The Duke of Cambridge is turning 39 on Monday, June 21, one day after Father's Day.

Royal expert Katie Nicholl thinks his wife Kate will do everything she can to make sure her husband enjoys his special day after he endured a difficult period due to his rift with Prince Harry and the loss of their grandfather Prince Philip in April.

The author predicts Kate and William will spend the day at Kensington Palace with their children Prince George, seven, Princess Charlotte, six, and Prince Louis, three.

Kate will make sure her husband feels appreciated on his birthday, Katie Nicholl said
(Image: PA)

Ms Nicholl told OK Magazine: "Kate always makes birthdays and celebrations special for William and the children.

"She's very much like her mother Carole in that respect. She'll be aware that this year has been tough for William and will want both his birthday and Father's Day to be special for him."

William will likely spend the day with his wife and their three children

She added: "Kate keeps William very grounded and she likes to show how important he is to her and the children.

"Especially after everything they've been through this year. It's only brought them closer."

According to Ms Nicholl, the Duchess of Cambridge will bake a cake to celebrate her husband's birthday and their children will make homemade cards and gifts.

Prince Harry and Meghan Markle have opened up on their struggles as senior royals
(Image: UK Press via Getty Images)

It comes as Kate announced the launch of a centre for early childhood development today.

The Duchess of Cambridge, who hopes to help generations of kids by giving them the best start to life, wants the issue to be treated as seriously as climate change.

In a video to mark the launch of the Royal Foundation Centre for Early Childhood, Kate, 39, said: “[The aim is] to raise awareness of why the first five years of life are so important for our future life outcomes.”

She added that she hopes to help create a “happier, more mentally healthy, more nurturing society”.

The centre is publishing its first study – Big Change Starts Small – which has found failing young children costs the economy £16 billion per year in England alone.

An aide said: “The Duchess has made the observation that the more you learn about the science of early childhood… the more you realise this is the social equivalent to climate change.

“But it is not discussed with the same seriousness.”