On an average there is hardly one breast fed child in a coach. There is no point in wasting a berth in a coach by reserving it for breast feeding. More over it would not be convenient for the feeding mothers as the nearby berths may be allotted to males.
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Earlier, a coupe of 6 seats in sleeper class (normally seat no.1-6) was reserved for Women. That arrangement could be started with a provision of curtain so that breast feeding can be conveniently given to small children travelling in coach.