text: Spotted: Pippa Middleton is said to have been buying up the mull-cloth nappies in Geneva . With the birth now imminent, relatives of the forthcoming Royal baby will be ready to shower the newborn with expensive gifts from London’s smartest shops. But the Duchess of Cambridge may be in line for a more practical present for her baby – a supply of biodegradable nappies from her sister, Pippa Middleton. At £4 each, the mull-cloth nappies are not cheap and they are yet to really catch on in the UK. But they are all the rage in Europe and Pippa, 31, may have learned of their merits during one of her frequent trips to Switzerland where her boyfriend Nico Jackson lives. Shoppers in Geneva have reported seeing Pippa buying the nappies in a shop there. Most of their appeal comes from the fact that they are made from natural fibres – meaning, unlike conventional nappies, they don’t end up in landfill heaps. Kate is unlikely to be too concerned about their cost but will know that using eco-friendly nappies will please the baby’s grandfather, Prince Charles, a keen environmentalist. Pippa will be aware that Kate adores natural clothing materials. The first photograph taken of Prince George as the family left St Mary’s hospital in London in 2013 showed him wrapped in organic muslin cotton swaddling from a clothing brand Aden + Anais. Pippa has also recently been seen visiting a high-end baby boutique in Geneva where she enquired about a £140 rocking chair. She has also spent a ‘small fortune’ on baby grows from clothing brand Arsène et les Pipelettes, according to an eyewitness. Eco-friendly: The nappies are very popular in Switzerland, but have yet to catch on in the UK . She bought in neutral colours, suggesting that even she has not been told whether Kate is expecting a boy or a girl. Last night supporters of the Duke and Duchess were camped outside the private Lindo Wing of St Mary’s Hospital in Paddington, London, where the Duchess is expected to give birth imminently.
target: Pippa is said to have bought the baby a supply of biodegradable nappies .
  Shoppers in Geneva, Switzerland, spot her buying the mull-cloth nappies .
  The natural fibres mean the baby essentials don't end up in landfill heaps .
  Likely to be a hit with new royal's environmentally conscious grandfather .