The constant laughter of baby was actually a rare brain tumor

However, tests eventually revealed that the explosions were triggered by a hypothalamic hamartoma, a benign tumor of the brain causing "gel-like" epileptic seizures – also known as "laughing fits".

When he was two years old, the doctors were finally able to perform a ten-hour operation to remove the growth and his seizures stopped.

Gemma, her 32-year-old relieved mother from Winscombe, in northern Somerset, said, "To be honest, we just thought that he was so happy all the time.

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"It was a little laugh, but it seemed to get longer, like a rehearsal record.

"People were telling us," Is not he a happy boy? "And it was a really happy little boy, but his laugh was not laughter, it was something else.

She added, "There was no break, the dull laugh was constant, and for a long time we did not know why.

"We were exhausted and so happy when, after two long years, the doctors were finally able to operate on Jack and end his seizures."

Gel tears also occur in children with epilepsy and involve sudden bursts of energy, usually in the form of laughter or tears.

Jack, now four years old, sneered while he was awake and asleep.

Gemma, a credit checker at Thatchers Cider, said that by believing that Jack was happy, the family was prevented from sleeping by lack of sleep because of his bursts of laughter.

Jack was moved downstairs to sleep away from his older brother, who is now nine years old.

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During Jack's six-week check-up, a health visitor told Gemma that she had never heard Jack's laugh and was worried.

"I felt horrible that another woman noticed it in my baby and it was my mother who understood it," Gemma continued.

She immediately took Jack to see the general practitioner, who was puzzled and referred the baby to an ear, nose and throat specialist (ENT).

"At that time, none of us slept at all and I begged the doctors to do something," Gemma said.

"The sound was unforgiving and so unpredictable. It was hard to fall asleep, because I did not know when the noise was going to happen again. "

The ORL team referred the family to a neurologist at the Royal Bristol Children's Hospital.

An MRI showed that he had a tumor the size of a grape at the base of his brain, which was at the origin of the gelatin crises.

Gemma added, "It was a huge relief to know what's wrong with him, but also heartbreaking to think he went through all these trials."

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His other milestones remained unchanged by laughter and he continued to eat and began to learn to speak.

"All of his other areas of development were so amazing, like his word and understanding, but he was laughing all the time," Gemma said.

"That did not stop him from eating solid foods at six weeks or walking a year – in fact, strangely, he could walk and laugh at the same time.

"He will spend his day as usual, but he will laugh too."

Two years after the start of bursts of laughter, he was operated on at the Royal Royal Children's Hospital of Bristol.

Since the procedure, Jack has not had a fit of laughter.

Although his parents admit that they can always be nervous when he laughs naturally – as he often does when joking in cartoons on TV – they are so grateful that he can lead a normal life.

"The day after the operation, we realized that Jack had not laughed once, which was a strange feeling," Gemma said.

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"We were sitting around waiting, but he did not do it.

"But when we heard him laugh for the first time, it was unbelievable.

"Hypothalamic hamartoma is so rare and I want other parents to know that there is light at the end of the tunnel and things are getting better.

"This operation has changed Jack's life, and ours, and we are very grateful."