One-week-old babies with blue lower eyelids may be caused by sleep, trauma, allergies and other factors. 1. Sleep: lack of sleep and poor sleep quality in one-week-old babies may lead to impaired blood circulation in the veins around the eyes, resulting in eyelid bruising. 2. Trauma: when the baby’s eyelids are bumped, hit and other trauma, it can lead to damage to the veins of the eyelid tissue and poor blood return, resulting in eyelid bruising. 3. Allergy: when the baby suffers from allergic diseases, such as allergic rhinitis, it will lead to obstruction of venous circulation and reflux in the eyelids, resulting in the symptoms of eyelid bluing. One-week-old babies with symptoms of blue lower eyelids, it is recommended to go to the hospital in a timely manner to identify the cause of the disease and then carry out the relevant treatment.