You have to read labels very carefully. I only found 1 bread that was safe and it was an italian type bread.
Here is a list of ingredients to avoid for MSPI:
MILK FREE DIET
Avoid foods that contain any of the following ingredients:
*artificial butter flavor
*butter, butter fat, buttermilk
*casein
*caseinates (ammonia caseinate, calcium caseinate, magnesium caseinate, potassium caseinate, sodium caseinate)
*cheese
*cottage cheese
*curds
*custard
*half and half
*hydrolysates (casein, milk protein, protein, whey, whey protein)
*lactalbumin, lactalbumin phosphate
*lactoglobulin
*lactose
*milk (derivative, protein, solids, malted, condensed, evaporated, dry, whole, low fat, non fat, skim)
*nougat
*pudding
*rennet casein
*sour cream, sour cream solids
*sour milk solids
*whey (delactosed, demineralized, protein concentrate)
*yogurt
*brown sugar flavoring
*caramel flavoring
*chocolate, milk chocolate (cocoa butter is ok)
*high protein flour
*margarine
*natural flavoring
*Simplesse A "D" on a product label next to a "K" or circled "U" may indicate the presence of milk protein
SOY FREE DIET
Avoid foods that contain any of the following ingredients:
*miso
*shoyu sauce
*soy (flour, grits, nuts, milk, sprouts)
*soybean (granules, curd)
*y protein (concentrate, isolate)
*y sauce
*textured vegetable protein (TVP)
*tofu ingredients
*flavorings
*hydrolyzed plant protein
*hydrolyzed soy protein
*hydrolyzed vegetable protein
*natural flavoring
*vegetable broth
*vegetable gum
*vegetable starch
**Studies show that most soy allergic individuals may safely eat products containing soy lecithin and soybean oil
Also I read back through your other post and you mentioned your lo is senstive to oats and barley? What about wheat? If it is just oats and barley, you need to be careful with that in bread also.