Karina, I was going to suggest blocked tear ducts too. Logan has this also. I told Simone to bath his eyes at every bath time and frequent intervals during the day. Just use a cotton ball with some saline or cooled boiled water and wipe from the inner corner to the outside once. Throw away that ball and get a fresh one and do it again. You can also softly massage her tear duct with one of your fingers. Just put your finger under her eye, near the duct and very hently massage it in little circles.

Some booby milk in her eye is also great as it's full of antibodies.

If it continues or you think it is getting worse then yes take her to the Dr.

Hope all of that helps you hun. Oh yes, it's very common too.