The HSE has apologised for the brain injury suffered by a 12-year-old girl at birth.
Roisin Conroy from Dysart in Portlaoise is to receive an interim €2.6m payout as part of a High Court settlement.
Roisin, who has cerebral palsy as a result of her injuries, sued the HSE and consultant John P Corristine, through her mother, Mary Conroy.
Her father Kevin read a statement to the media outside court.
"The facts of the case, as determined by expert medical opinion, after forensic work by our solicitors, are that Roisin suffered serious injuries at birth, and that these injuries were entirely avoidable," he said.
"It took nine years for these facts to come to light."
"We were distraught to hear this, particularly as it went completely counter to the assurances from our private consultant Dr Corristine that nothing could have been done to prevent these injuries, and we were just unlucky."