Board Thread:Spoilers!/@comment-2153169-20140402112823/@comment-9232373-20140415183155

My theory: I think it is Rumple... Like Dan said above, the father needs to be a sorceror... a powerful one... baby Zelena was snapping trees already... Also, it would explain the origin of the letter Rumple wrote to Cora about finding her first born. Why else would he write that to Cora other than to say "I know what you did"? Finding out she is preggo was the final thing that convinced Cora she had to remove her heart... when she says her heart is a source of weakness, she meant her soon-to-be-daughter, not Rumple.