The father of an 11-year-old boy who had sex with his 20-year-old babysitter, says the incident was a “notch on his belt” for the son.

Jade Hatt, now 21, who also had a fling with the father, was meant to be looking after the child but instead got him to strip and “climbed astride him”, reported the Swindon Advertiser.

The woman was described as “immature” by the victim’s father at the trial and the judge chose to avoid sending her to jail.

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Prosecutor Hannah Squire told Swindon Crown Court: “The defendant was friends with the boy’s father, with whom she had had a brief sexual relationship.

“He would ask her to babysit; she had babysat his 11-year-old son on six or seven occasions. On one of those occasions this offence took place.

“It was during the day and the boy was off school. The defendant arrived at about 11.30am.

“The boy was laying down, Jade Hatt sat on top of him, sat astride him, took off her clothes and removed his.

“In his words she started bouncing on his private parts. Sexual intercourse took place. According to him it was fairly brief: about 45 seconds. She told him she enjoyed it, he said he had not as it was wrong.”

The boy’s father noticed a “love bite” on the boy’s neck and also saw messages between the pair that were diverted between his phone, revealing the incident.

Rob Ross, representing the woman, said his client was a small and immature but the victim was advanced for his age.

Reading from a statement submitted by father to the court: “He said ‘I know he told her he was 15. He looks older than his years.

“‘He is sex mad. He would have been fully up for this experience and in many ways sees it as a notch on his belt and is totally unaffected by it.'”

Mr Ross said the woman “clearly doesn’t operate at the level of a 20-year-old”.

She was honest with the police about the incident, according to Mr Ross.

Judge Tim Mousley QC told the court the exceptional circumstances of the case allowed him to decide a verdict outside of the sentencing guidelines.

He said: “Having read everything before me, it was quite clear he was a mature 11-year-old and you were an immature 20-year-old so that narrows the arithmetic age gap between you.

She received a six month jail term, suspended for two years.

She will be registered as a sex offender for seven years and she is banned from unsupervised contact with young boys for two years.