Yummy Mummy is a small store in the middle of a quietly commercial block of Manhattan’s Lexington Avenue. Flanked by a dog accessory store and a beauty salon, it is surrounded by expensive boutiques specializing in children. A quick glance reveals a children’s optician, a children’s photographer, a handful of children’s clothing stores, and a nanny agency. Tastefully decorated and brimming with designer apparel and accessories for nursing mothers, Yummy Mummy fits right in. Its plum brown awning greets customers and passers-by with a friendly, if pointed, message: happy breastfeeding.