My son (who is just about three weeks old now) was born with a blocked tear duct in his left eye, which we also massage and have been putting an antibiotic ointment on it (per dr.). My daughter is 16 months and did not have this, but there are a bunch of kids at her daycare who did. All but one of them outgrew it by 6-9 months; one little boy needed surgery to correct it but he recovered very quickly and is fine now. My son also has the green gunk coming out of his eye, which is a little yucky, but we just use cotton balls to clean it off. We're waiting until 9 months to see if it resolves itself (which it probably will, based on what we've seen with other kids) and if it doesn't, we'll get a referral to an eye doctor. Before my daughter started daycare I had never heard of it, but I asked her teachers and they think it is pretty common (sometimes it's nice to hear it from someone other than the doctor!) and generally resolves itself.