Police are appealing for public assistance to help locate missing Allendale mother Melinda Bliss and her son Ethan Bliss.
The 47-year-old was last seen with her 6-year-old son in Melbourne CBD on 8 March.
Melinda is described as Caucasian, 165cm tall, solid build with brown shoulder length hair.
Ethan is described as Caucasian, 120cm tall, thin build with short brown hair and was wearing light blue sandals.
Police and family have concerns for their welfare due the length of time that they have been missing and Ethan's young age.
There are also concerns for Melinda due to a medical condition.
Melinda and Ethan are known to frequent the Melbourne, St Kilda, Altona North or Allendale areas.
Investigators have released an image of Melinda and Ethan in the hope that someone may recognise them and provide information on their current whereabouts.
Anyone with information about Melinda and Ethan is asked to contact Melbourne West Police Station on 8690 4444.