Western Australia police are appealing for information after a seven-year-old child was sexually assaulted at a home in Ellenbrook.

The child went to bed as normal on the evening of Sunday, December 26.

She disclosed to her parents that she had been sexually assaulted during the night on the morning of December 27.

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Police are currently searching an area in Ellenbrook, a north-eastern suburb of Perth, for items that may assist this investigation.

This includes a window fly screen and a girl's pyjama top that are missing from the house.

Investigators would like to speak to anyone who has seen these items, or has dashcam or CCTV.