Namrata Nangia and her husband have been toying with the idea of having another child since their five-year-old daughter was born.But it always comes back to one question: 'Can we afford it?'She lives in Mumbai and works in pharmaceuticals, her husband works at a tyre company. But the costs of having one child are already overwhelming - school fees, the school bus, swimming lessons, even going to the GP is expensive.It was different when Namrata was growing up. "We just used to go to school, not...