In Lincolnshire nursery staff have been receiving letters guiding them on how to spot the warning signs.
Nursery staff need higher levels of training and sufficient resources to work with families as well as children.
Tests are no substitute for the in-depth knowledge nursery staff have of children in their charge.
12.55pm GMT Lunchtime summary Elizabeth Truss, the education minister, has dismissed claims that it is unrealistic to expect nursery staff to look after more children.
But a new study suggests many nursery staff – and parents too – see time spent using screens as a bad thing, liable to make children unsociable or, even, obese.
Dame Clare wants to cut to 17 the over-prescriptive list of 69 skills that nursery staff and childminders must impart to their charges before they toddle off to school.
It's the hottest day of the year and there are 70 relaxed and happy mothers, dads, babies and nursery staff crammed into the shade of the main hall at Chandos East Community Links Centre.
Many parents do not want an increase in the number of children nursery staff are allowed look after; they are worried it will have a negative impact on the individual attention and care their child receives.
When we got there Sophie (one of the nursery staff) asked if we wanted a frog, it had been caught by her cats in the night and found in trauma under her kitchen table that morning.
We are particularly concerned about suggestions to increase the number of children under three that nursery staff can look after, due to the degree of personal attention needed by very young children.
Vidhya Alakeson, early years researcher at the Social Market Foundation think tank, said training standards needed to be improved if the status of nursery staff and other childcare workers was to boosted.
