The most common cause of heavy, yellow and sticky eye discharge in one year old babies is infectious diseases such as dacryocystitis & conjunctivitis. Conjunctivitis: is caused by an infection of the conjunctival tissue that covers the surface of the white eyeball and the inner surface of the eyelid. Dacryocystitis: is caused by an infection of the lacrimal sac, which is located underneath the skin at the inner corner of the eye. Both cause inflammatory oozing from the eye, which results in the formation of yellow, sticky eye droppings. When the infection occurs, it is recommended to go to the ophthalmology department of the hospital in a timely manner, and the doctor will make a clear diagnosis by doing a slit lamp microscopic examination, tear duct flushing examination, etc. It can be treated with antibiotic drops, such as moxifloxacin eye drops, etc., under the guidance of the doctor.