The same sort of research was banded about a few years ago about antibiotic use in children under one year of age resulting in a hugely increased risk of asthma. Further research on that seems to have seriously diminished the strength of the original research and its conclusions (or more accurately, journalists' interpretations of the meaning and conclusions of the research). I dislike articles like that, which are clearly intended to alarm on the basis of very little solid evidence. I put it in the same camp as the theories that stress in pregnancy causes dyslexia or autism; or that a child that doesn't crawl is missing out on a hugely important part of its development and is heading for a lifetime of dyspraxia (that may have been avoided if he/she had been taught to crawl?!)... ie we look at things like stress and medicines and logically presume that they will cause some kind of long term harm, so skew the way we interpret the evidence to fit our theories. They may contribute to problems in some way, but that doesn't give us the right to claim we can prove it when we can't, or make people change their behaviours as a result of an unlikely claim (again, it is more often the way journalists report on this type of research that gives the impression it virtually proves something when it doesn't). It can scare people and make them feel hugely guilty for no particularly good reason to read articles like this.
I really do not believe that the avoidance of Calpol in early life will protect anyone from developing asthma or eczema if they are susceptible to developing these conditions. I do, however, believe that it is really not a good idea to regularly give a baby Calpol, but I don't need alarmist articles to make me think that.