Hello `Girl! Welcome to Mudcat from one of the Hull crowd. I shouldnt worry. Most of the children of the fans of traditional music that I know have been attending festivals and listening to our kind of music since they were in the woumb and they seem to have turned out ok. I am sure that introducing him to a traditional song at the ripe old age of 4 months will do no harm. In fact he will probably become a more critical and choosey listener as he can indicate his musical likes and dislikes to you far more effectively than an embreyo could!