Not well developed
Blocked tear duct
is quite common in newborn babies, mostly because the duct is still quite small and well-formed yet.
Usually after 6 montns or so as the duct enlarge and mature (more well-formed, it drains better and the blockage is resolved. Often, no treatment is needed. Some persistent cases may need a bit of probing to open it up. Hope this makes sense to you. Good luck.