Adelaide defender Kyle Hartigan has become the third Crow within a week to announce he is expecting his first child with wife Emily.

On Monday, the 27-year-old posted to Instagram an image of him and Emily holding a pregnancy test.

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Emily Hartigan also posted to her Instagram an image of a sonogram with a message:

"We are so in love with our newest family member who is due to throw the best party yet in late September!," she wrote.

Hartigan's announcement follows Daniel Talia's, who shared his news last Tuesday, and Bryce Gibbs' who shared his last Thursday.