when she had her 1st kitten, it went smoothly, the baby grew up healthily. but her 2nd baby was still-born. the memories of the 1st kitten were real. the dream was just a speculation. she might be dreaming of her could-have-been 2nd child.
“Pathological”, published in his collection Kotto. Had to double check. Whole thing is public domain eg here’s Archive dot org (has the orig. illustrations!)