The Oriental Darter or Indian Darter (Scientific name: Anhinga melanogaster) is a water bird of tropical South Asia and Southeast Asia. Wiki has this to say about the nests of darters: They build a stick platform on the nest tree which is usually surrounded by water. Several pairs may nest close to each other. The branch is flattened by the birds prior to the placement of the sticks that form the nest platform.
And about the chicks: The newly hatched chicks are bare and covered with some down on the head. As they grow, they become covered in white down. The chicks feed by thrusting their heads down the throat of their parents.
This nest with chicks was clicked at Ranganathittu in Oct/2015.