Child health experts are taking the unprecedented step of trying to contact 26,000 families across Wales to get a better understanding of how premature babies develop in the long term.
Dr Martin Edwards, one of those leading the study from Cardiff University, says there's been minimal research in this field: "This is an area of the Health Service that hasn't really been monitored or observed until now."
More top news
Any mist or fog soon clearing to leave a fine day, with good spells of sunshine and light winds
It'll be a dry and fine end to the day, with a dry night then following.
The world bog snorkelling championships returns to Llanwrtyd Wells this weekend.