Pocket knitted dress containing 840 cigarette butts – a packet a week for an average pregnancy.

If you carry on smoking during pregnancy you are more likely to suffer complications while pregnant. On average a smoker’s baby will weigh 8oz (220g) less than a non-smoker’s. This may be because cigarette smoke reduces the amount of oxygen that the baby gets through the umbilical cord.

The following chemicals also pass into a baby’s blood-stream:

• Carbon monoxide – the lethal gas that comes out of car exhausts.

• Ammonia, which is found in household cleaners.

• Cyanide which is extremely poisonous.

• Butane which is used in fuel lighters

Photographs : Chloë Stewart