Hi, D.. Well, I never had any problems with feeding my baby yogurt. I gave it to him after he started eating othe solid foods. I wonder why the pediatrician said no? I know you shouldn't give it to a newborn, just like you shouldn't give honey to a newborn (even friendly bacteria can be harmuful to a newborn), but yogurt shouldn't be a problem.
See if you can possibly call the pedi's office and ask why he said not to feed yogurt to an 8 month old. Does your baby have an allergy to milk? He may be concerned about possible allergies to the fruit or other flavors mixed into the yogurt, too. If your baby has had other health issues, asthma, etc, those may be factors, especially where potential allergies are concerned. I would definitely try to get a better answer than just "no," because it's not what I would expect a pedi to say about yogurt.
Peace,
Syl