R.K.
http://www.amazon.com/Nuby-Natural-Silicone-Travel-Feeder...
Is this what you are talking about? You aren't supposed to suck on it you are supposed to squeeze a little out onto the spoon and feed it to baby like you would with a regular spoon. I would not feel comfortable if it's a bottle that she's supposed to suck on for the same reasons you never put cereal in a regular bottle. If she can't handle a spoon hold off on the solids she isn't ready yet.
Edited: first off you should not start solids before 6 months starting before then can cause allergies, digestive issues, been linked to obesity among other health issues. Second cereal in a bottle is a choking hazard!