I found this here
http://www.wholesomebabyfood.com/juiceforbaby.htmMaking homemade juice is not recommended for infants as you are unable to pasteurize the juice and thus it's possible that some bacteria or other unsavory items may get into the juice. For adults and older kids, this isn't as much of an issue. Pasteurization of fruit juices helps to eliminate bacterial concentrations that may cause food poisoning. This is why it is recommended to NEVER give your infant (And even your toddler) apple cider that has not been pasteurized.
Feeding infants (of a certain age) raw fruits should pose no danger if you totally cleanse the fruit, peel the fruit and NOT store any remaining portions. Possible bacterial contamination in fresh fruits is just one of the reasons that many pediatricians recommend cooking fruits until a baby is about 8 months old.
There's more to read on the site.