Several studies have established a direct link between prematurebirth, quality of life and the age of the mother (less than 18 and over 35).
Professor Emile Papiernick has evidence to show that a group of factors have an effect on prematurebirth: working outside in the open air, unaccustomed exercise, physical labour and long journeys.
In such cases, you need to take the right precautions, rest up as much as possible and take maternity leave (speak to your doctor about this).