What is the status of the hadith telling pregnant women to eat frankincense so that the baby's intellect is enhanced?

Summary

The hadith appears in al-Dailami's Musnad al-Firdaus through Abu Hurairah, but its chain includes Muhammad bin Ukasyah al-Kurmani, who is judged to be a liar and a fabricator of hadith. A similar narration was judged fabricated by Ibn Iraq, while Ibn Asakir called it munkar. Eating frankincense is described as a practice of the early pious predecessors based on their experience that it strengthens memory, but attributing the saying to the Prophet requires caution because of the warning against lying in his name.

Written in our own words from the original fatwa — check the source before acting on it.