A child as young as five years old was treated for sexually transmitted infection.
Fiji's National Adviser on Family Health, Dr Josaia Samuela said according to national records three children between the ages of five to nine were treated for STI last year.
He said records also show that 105 newborns tested positive for syphilis over the past 3 years.
"This is just tip of the iceberg. Many figures may be under-reported," he said.
He said on average 14 children between 10 to 19 years were seen every month at STI clinics around the country.
Dr Samuela said about 170 children aged 10 to 19 were treated per year.
He said it looked like young children were having sex and parents need to look after their children.
A Ministry of Health official said children having STI meant that they were sleeping with older people who were infected.
He said they needed to have strong evidence to take the case to police if they suspected the child was abused.
According to the official many girls who were sexually active faced poverty or were manipulated.
Dr Samuela said the figures were alarming.
"This is really sad when you look at it. Parents really need to look after their children at home and at school," he said.
"Some babies also have STI's and mainly it was passed on from the mother who was positive for syphilis but was not seen and treated early at the clinics," he said.
He said there was same number of children coming with STI's from last year.
According to Dr Samuela children either came in by themselves or brought friends along whom they trusted.
"Usually when they come they are given tablets to take," he said.
"There seems to be a drop in the age bracket of people coming in for treatment," he said.
Dr Samuela said there needs to be a combined effort from the community, church, parents and neighbours to curb the problem.
"About 700 to 800 adults are also treated for STI's every year," he said.
He said the figures could increase and it was scary.
"We have 303 cases with HIV/AIDS not counting the ones who go overseas for tests," he said.
Dr Samuela said it was important to teach people about STI's so that they come forward for testing.
