Clegg has said that he had considered extending paternity leave from the current two weeks, but concern had been voiced within Government and from business groups about the cost.
Flexible leave will be reviewed by 2018, when extending paternity leave will be looked at, Mr Clegg is expected to announce.
These are major reforms and, at a time of continuing economic difficulty, it's sensible to do them in a number of steps, rather than one giant leap. More and more men are taking on childcare duties, or want to, and flexible leave builds on that.
More top news
No one gave him a chance - but Donald Trump has just pulled off one of the greatest feats in modern American political history.
German police are investigating an online picture thought to be of two British men doing a Nazi salute at a former concentration camp.
Late sunshine here and there this evening - but more cloud for southern Scotland, northern England and Northern Ireland again.