American Francesca Easdon said she just wanted to make her five-year-old Kyler "smile at lunchtime" after asking his carers tell him "his mommy loves him".

But she was shocked after her child handed her a note back with a rude handwritten message.

Her letter had initially read: "Please tell Kyler that his mommy loves him so much and I’m thinking about him.”

The handwritten note was shared on social media. Picture: Facebook

But in response, a worker, who has since been fired, wrote: "NO! Put him on a diet and GO AWAY!"

In a public Facebook post, shared hundreds of times, the fuming mother wrote: "I sent this note in Kyler's lunchbox, thinking that it would make him smile at lunch time.

"We have been working with Kyler on his eating, he’s extremely picky! I have been introducing new healthy options in his lunchbox and discussed the changes with his school. And for the record, I feel that Kyler is absolutely perfect the way he is, I’m just helping him make healthier choices. Instead of his school being supportive

"I am disgusted that I put my trust in these people to care for my child and this is what I get in return.”

His mother was furious and shared her dismay. Picture: Facebook

"I do everything in my power to build my son up and make him feel good about himself because he is amazing."

Staff told a local newspaper that the note was not intended to be shared with the mother and that the worker has since been fired.

Horrified mother told to 'go away and put son on a diet' by nursery worker