The reasons for this are not known.
The study excludes twins, but multiple births through assisted reproductive technologies (ART) are much less common in Australia than in other countries.
"Overall most ART offspring have grown into healthy young adults with a quality of life and educational achievement comparable to those of their non-ART-conceived peers," said study leader Professor Jane Halliday of the Murdoch Childrens Research Institute.
The study is reassuring for health professionals and families, said co-author Professor Robert McLachlan of Monash IVF.
There had been around 150,000 ART births in Australia so far, he said.
"On average, one child in every classroom is an ART baby.
"We have a social responsibility to look back and reassure ourselves of its safety."
He said the study was based on subjective feedback from parents and children.
A more objective follow-up with scientific assessment is now needed.
- AAP