Naming their daughter Hannah, the couple had the help of the same sperm donor they used to conceive their first child, Alexandra, who is now three years old.
While they have not revealed the identity of the sperm donor, when announcing their second pregnancy in December last year Senator Wong said Alexandra was helping spread the good news.
Penny Wongโs daughter, Alexandra, holds baby Hannah.
โLike all families we had to think about whether we tell the toddler because sheโs notorious โ she doesnโt know what a secret is,โ Senator Wong told The Advertiser.
โBut we decided to tell her because we thought it was important she knew.
โWhich was fine except at the Labor convention she sat reading The Gruffalo to a baby over and over againโฆ I came over and asked how it was going and a friend said โitโs all really good but sheโs just told everyone Mummyโs got a baby in her tummyโ.โ
And baby Hannah isnโt the only recent arrival in the Labor party, with South Australian MP Amanda Rishworth giving birth to her son, Percy James, in March.
Labor frontbencher Kate Ellis also due to give birth later this year.