They raise the world's happiest children - so is it time you went Dutch?
Two toddlers have just chased each other to the top of a climbing frame and are jostling to get down the slide first. Their mothers are lost in conversation on a nearby park bench. In the distance, a dog barks and a little boy ambles along on his balance bike, trailed by his grandfather who is pushing a buggy. A gang of older children in tracksuits comes racing along the bike path, laughing and joking. They overtake a young mum who is cycling more slowly, balancing a baby in a seat on the front of her bike and a toddler on the back.