I have always thought immunization was essential and worthwhile, however, my friend who recently gave birth was told by one of the midwives that the Hep B immunization has been linked to the development of autism in some children - something about levels of mercury. She went ahead and had the shots anyway, but the idea is still niggling at her. Is there any scientific/concrete evidence to support this "theory"? I would feel more at ease if my baby was immunized but not if there was risk of developing a condition like autism.