nesting

The tendency to prepare a home for the arrival of a baby, often involving cleaning, organising, and decorating.

"She was in full nesting mode, scrubbing every surface in the house."

The activity of building or occupying a nest, especially by birds or other animals.

"The birds were busy nesting in the eaves of the house."

Present participle of 'nest'.

"The swallows are nesting in the barn."