"I don't care how it comes back, I don't need to know who...just please get it back to me asap!
"If you know someone who brought home a few roasts last night please check your freezers."
Burns kept the placenta after her son Dante was born five months ago and she planned to bury it somewhere significant.
She couldn't remember if the container had been labelled by her midwife and is worried the thief would mistakenly eat it.
Shocked friends posted messages of support on Facebook.
"Omg I hope they don't eat it," one friend wrote.
Another posted: "Dats just creepy babe..i hope u get it back.. wats wrong with people."