Reference: Fataawa Ramadhaan – Volume 2, Page 544, Fatwa No.526
Fataawa al-Lajnah ad-Daa.imah lil-Buhooth al-‘Ilmiyyah wal-Iftaa. – Fatwa No.9517
Question: Does cutting the hair and trimming the nails during the day in Ramadhaan break the fast?
Response: Cutting the hair and trimming the nails and plucking the hair from the armpits and trimming the pubic hairs, all do not break the fast.
And with Allaah lies all the success, and may Allaah send prayers and salutations upon our Prophet Muhammad ﷺ and his family and his companions.