how do you know they are swallowing some of it? We tried to give DS some cereal last night and he opened his mouth or the spoon and kept the cereal in his mouth, smooshed it around with his tongue and then some came back out! I'm not sure if it was all of what I gave gim or just some b/c it was mixed with a lot of spit.

Also, do I make my regular bottle and use that formula to make the cereal or do I give him a full bottle and make formula separate to make the cereal?