I would recommend a distinctly conservative attitude on baby feeding. I suspect a lot of babies are sensitized to foods offered them too early in an unrealistic effort to make them gain weight faster. For instance allergy to peanut butter which was unknown when I was in medical school is now common enough to have many parents demanding that it not be allowed in school lunches. I wonder if this is from giving babies peanut butter too soon, or if it from the inclusion of peanut oil in skin preparations such as sunscreen lotions used on children with skin lesions such as psoriasis which could be a source of powerful sensitization.