It's no worse to call a baby ugly than it is to call a child, teenager or adult ugly. Unpopular opinion here, but.. I think the real issue here is why so many people SAY a baby is cute and, why are we expected to swoon over babies when in fact most newborns are just ugly. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.