The cheating woman's partner believed he was the father of the child - until it was born.
Website LasCincoDelDia, which broke the news, said: “Neither her closest female friends or her family knew she had sex with the midget stripper but once she had her son in her arms, she broke down and confessed what had happened.
“As you can imagine no-one that sleeps with a stripper at her hen night broadcasts it or at least they try to take their secret to the grave.
“But the protagonist of this episode had no choice but to confess and could never have pretended the boy was her husband’s because of a little problem - the child was born with dwarfism.”
Her encounter is said to have occurred at the start of the year.
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Neither the hospital, based in Valencia, or the woman have been named.