Six-month-old babies always rub their eyes when they sleep, may be the presence of foreign bodies in the eye, may also be caused by eye inflammation, allergic diseases. 1. The presence of foreign bodies in the eye: when the child sleeps, foreign bodies enter the eye, causing eye irritation, causing eye discomfort, they will frequently rub their eyes, which may be accompanied by more than one cry, eye redness and other symptoms. 2. Eye inflammation: keratitis or conjunctivitis may be related to infectious factors, due to the presence of inflammatory substances, which will lead to the baby always rubbing the eyes in bed, there may also be photophobia, tearing and other symptoms. 3. Allergic diseases: allergic conjunctivitis may lead to itchy eyes, which will make the baby always rub his eyes when he sleeps, and may also be accompanied by conjunctival congestion, eye redness, tearing and other symptoms. If your six-month-old baby is always rubbing his eyes during sleep and there are other abnormalities, it is recommended that you take your baby to the doctor for examination and treatment.