Jacinda Ardern's special message on Children's Day after receiving letter

Jacinda Ardern has posted a special message on Children's Day, thanking all the children who have written to her.

The Prime Minister had received a letter from a child named Emilia, which Ardern shared to Facebook.

"Dear Jacinda. I would like to be a leader at my school one day," Emilia wrote to Ardern.

"Mummy said you might have some ideas for me about how to be a kind leader."

Ardern says reading letters like this "is one of the best parts of my job".

"This Children's Day I want to say thanks to the hundreds and hundreds of kids who believe in the simple power of a letter (and drawing!)" she wrote on Facebook.

"No matter how many years pass, I hope they all hold onto that belief that they can make a difference....because they already do.

"I seriously underestimated how many there would be, but I still read every single one."

Ardern has previously shared other letters she's been sent, including one from an  11-year-old who attempted to bribe Ardern into investigating dragons and psychics.

"We were very interested to hear your suggestions about psychics and dragons, but unfortunately we are not currently doing any work in either of these areas," Ardern replied.

"I am therefore returning your bribe money, and I wish you all the very best in your quest for telekinesis, telepathy and dragons."

Another kid thought politicians should make everything free "because then there would be no such thing as poor people".

And a seven-year-old thought that the Prime Minister's powers were limitless.

"Dear Jacinda, can you change the boring grey toasters into bright colours. Perhaps you could pass a law?" their letter apparently said.