We've just come back from the Pead's as he asked us if Mateauz gets sunshine? WTF??? I asked him why and he said that his bow leggedness could be from being deficent in vitamin D I dont sit and time how long we are outside for andim wondering if I have to now?

SO does anyone know how long is enough sunshine a day to keep the Vitamin D at bay? and does it vary from adults to children?