The Prophet (ﷺ) used to seek Allah's protection for Al-Hasan and Al-Husain by saying:
U`īthukumā bikalimāti ‘llāhit-tāmmati
min kulli shayṭānin wa hāmmah,
wa min kulli `aynin lāmmah
I seek protection for you in the Perfect Words of Allah
from every devil and every beast,
and from every envious blameworthy eye.
Reference:
Al-Bukhari4/119.