On the edge of the Eastern Express Highway, between Chembur and Dharavi, there's a cluster of shacks set up by a fetid drainage canal. Presumably this is how most slums start off: the floors are rough cement or are simply the verge of the road or a pavement; the shacks themselves consist primarily of plastic sheeting over wooden frames. In time doubtless the slum will either spread, or get torn down by the authorities.
The kids in the area were very keen to have their photograph taken. After a while some of them took me down an alley between shacks - an earth and stone path just wide enough for a grown man to walk down. At the end was a simple hut inside which were a couple of women and these babies. The one on the left seemed very malnourished, and maybe otherwise unwell. The kids were feeding it from a bottle, but presumably with formula diluted by dirty water.
Further down the road women and kids were pulling up buckets of water from a well dug down into the tarmac of an access road, by the pavement. (Maybe accessing one of Mumbai's unreliable water mains?).