I have a 7 month old (adopted also!)who went from wanting a bottle every 4 hours to every 2 hours, at 3 months old. He was ALWAYS hungry. A friend who is a nutritionist, and also worked for WIC, told me that the reason they say to wait until 6 months old to start solids is so that the baby is getting the majority of his nutrition from the breastmilk or formula. Also alot of babies' digestive systems are not mature enough yet for solids. She said that a lot of women would begin solids and find them easier to feed than bottles, then the baby would not be getting the nutrition he needs during his first year.
My ped. recommended cereal to satisfy my baby's hunger. So, at 4 months I began spoon feeding watery cereal to him. Within a week I learned what satisfied him best was a thicker consistancy, and twice a day. I MADE SURE he was still drinking at least 30 ounces of formula each day for the nutrition. The cereal actually helped him out a bit with his constipation too.
Now at 7 months he eats a whole bowl of cereal with fruit (about a cup and a half!) every morning, and stage 2 and 3 foods for lunch and dinner, PLUS drinking 24 ounces of formula per day! I find that he needs thicker foods, and wants to chew. (He complains if I give him applesauce unless I thicken it with a little cereal).
For the nipple: He is on size 3. I switched when he began fussing because the formula wasn't coming fast enough for him. (He would push the bottle away, then immediately grab for it again.)
Of course every baby is an individual, so I am sure you will figure out what is best for yours! Just go slowly...
I would like to hear your adoption story someday! I would like to get to know other adoptive parents in the area. You may email me if you want at: ____@____.com