Free school breakfasts 'must change', say Conservatives
Free breakfasts are usually offered before the school day starts
The Welsh government's Free Breakfasts initiative, launched 10 years ago, ensures primary school children can have a healthy meal to start the day.
But shadow education minister Angela Burns said some parents should pay to help improve the scheme's funding.
Education Minister Huw Lewis said take-up of free breakfasts was increasing.
Overall throughout Wales, eight out of 10 (82%) schools in Wales offer free breakfasts, even though it is available to them all.
In Newport, for example, it is around three in 10 schools.
Last year, out of the 264,186 pupils in Welsh primary schools, 46,262 had a free breakfast on the day numbers were collected.
That is fewer than one in five pupils who turned up for the scheme, which usually runs in breakfast clubs before the school day starts.