Parents who take their kids out of school to go on holiday could be fined.
A new law means that head teachers can decide to give the parents a £100 truancy fine if they take pupils out of school without special permission.
Travel agents have even been told to warn parents about the possibility of fines when they try to book holidays.
"Taking a holiday during term-time can mean that children miss important school time and coursework," education minister Ivan Lewis said.
'Every day counts'
This is all part of the government's crackdown on truancy and children missing school unnecessarily.
Research showed that almost every pupil took some leave from school during term-time, even though most of it was with permission.
""Taking a child out of school for a holiday without the head's permission is unacceptable and will be treated as truancy," Mr Lewis said.
"Parents must support their child and their school in making sure that every day counts."