The couple, who cannot be named to protect the identity of the children, had pleaded guilty to three charges of "engaging in conduct that was reckless and may have resulted in the child suffering".
The District Court was told the offences were committed over eight years after the children were diagnosed with Ehlers-Danlos Syndrome, which affected the connective tissue in their bodies.
The couple's daughter was aged between seven and 14 at the time of the offending, while one of their sons was between five and 11, and the other between nine and 11-years-old.