An infant or very young child.

शिशु

English Usage: The baby is sleeping in the crib.

Hindi Usage: शिशु पालने में सो रहा है।

Up to and including the present or the time mentioned.

अब तक

English Usage: She is still waiting for an answer.

Hindi Usage: वह अब तक जवाब का इंतज़ार कर रही है।