I've been a licensed child care provider for over 20 years, have raised two daughters and now have 4 wonderful grandchildren. I've had lots of experience in this area. :)
Start the baby on simple rice cereal, mixed with a little breast milk to the consistency that seems easiest for the baby to eat with a spoon. Anywhere from one teaspoon to three tablespoons will work. You may have to start low and slowly increase the amount until the baby becomes accustomed to the food. Next add pears in the first food size. You can do cereal in the morning and late in the evening and pears mid-day, if you like. Or you can mix the pears with the cereal two or three times a day...whatever works best for you and your child. Next food should be oatmeal. Give the baby three/four days to get used to each new food. If you like, you can add green beans or carrots once the eating pattern is established. You can continue this way until the baby has eventually tried all of the cereals, fruits and veggies in the first food section. No meats yet. Wait until a good pattern of bowel movements have been established before using bananas...they can tighten a child's bowels...and even applesauce will do this with some children. But once the bowels are regular and not too dry...the baby can have bananas and applesauce, too.
Juice is okay if you are careful. Too much juice and the baby might lose interest in the milk. We don't give juice very often in day care homes. We prefer that the children eat the fresh fruits and drink lots of water. You could put just enough juice in a bottle to flavor 4/6 ounces of water, if you like. And, if the baby's bowels are extremely hard to move you can use first or second food prunes to get them going good. Prunes work wonders. A small amount goes a long ways.
Now, another thing....when a baby has diarreah...we have what we call "the brat diet". B...bananas, R...rice cereal, A...applesauce, T...toast (dry toast). It works well and is usually given along with pedialyte to keep a child from dehydrating and getting back to regular bowel movements.
I hope this sheds a little light on things. Don't get frustrated if the baby doesn't seem to like the foods to start with. Take it slow and continue to offer it. They begin to get the hang of it after a bit. Be patient and consistent. It will work, I promise.
Let me know if I can be of more help. Good luck and God Bless.
Ms B.