“Thats Amore,” the Just Like Fire hitmaker, 37, captioned the image of Willow cuddling her baby brother.
Last month, the mom-of-two shared a sweet snapshot of her son sitting in his Bumbo seat.
Also in April, the proud nursing mama posted a breastfeeding selfie with her baby boy while he slept in the baby carrier.
The Family Portrait singer and husband Carey Hart welcomed their second child – son Jameson Moon – on Dec. 26, 2016.
After his birth, the singer posted a photo of Willow cuddling her newborn baby brother.