Revealed, ......See what smoking does to an unborn baby

These remarkable scans clearly reveal how smoking during pregnancy harms an unborn baby's development.

New ultrasound images show how babies of mothers who smoke during pregnancy touch their mouths and faces much more than babies of non-smoking mothers.

Foetuses normally touch their mouths and faces much less the older and more developed they are.

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Experts said the scans show how smoking during pregnancy can mean the development of the baby's central nervous system is delayed.

Doctors have long urged pregnant women to give up cigarettes because they heighten the risk of premature birth, respiratory problems and even cot death.

Now researchers believe they can show the effects of smoking on babies in the womb - and use the images to encourage mothers who are struggling to give up.

Image shows the 4-D ultrasound scan of two foetuses at 32 weeks gestation, one whose mother was a smoker (top) and the other carried by a non-smoker (bottom). The foetus carried by the smoker touches its face and mouth much more, indicating its development is delayed

As part of the study, Dr Nadja Reissland, of Durham University, used 4-D ultrasound scan images to record thousands of tiny movements in the womb.

She monitored 20 mothers attending the James Cook University Hospital in Middlesbrough, four of whom smoked an average of 14 cigarettes a day.

After studying their scans at 24, 28, 32 and 36 weeks, she detected that foetuses whose mothers smoked continued to show significantly higher rates of mouth movement and self-touching than those carried by non-smokers.

Foetuses usually move their mouths and touch themselves less as they gain more control the closer they get to birth, she explained.

The pilot study, which Dr Reissland hopes to expand with a bigger sample, found babies carried by smoking mothers may have delayed development of the central nervous system.

Dr Reissland said: 'A larger study is needed to confirm these results and to investigate specific effects, including the interaction of maternal stress and smoking.'

She believed that videos of the difference in pre-birth development could help mothers give up smoking.

Dr Reissland explains the science behind the ultrasound scans

Dr Nadja Reissland, of Durham University, said the ultrasound scans show unborn babies of mothers who smoke may have delayed development of their central nervous systems

But she was against demonising mothers and called for more support for them to give up.

Currently, 12 per cent of pregnant women in the UK smoke but the rate is over 20 per cent in certain areas in the North East.

All the babies in her study were born healthy, and were of normal size and weight.

Dr Reissland, who has an expertise in studying foetal development, thanked the mothers who took part in her study, especially those who smoked.

'I'm really grateful, they did a good thing,' she said. 'These are special people and they overcame the stigma to help others.'

Co-author Professor Brian Francis, of Lancaster University, added: 'Technology means we can now see what was previously hidden, revealing how smoking affects the development of the foetus in ways we did not realise.

'This is yet further evidence of the negative effects of smoking in pregnancy.'

The research was published in the journal Acta Paediatrica.