Sounds a little like she is going through a growth spurt, but also I agree with MrsPelly. Depending on how old she is, she might just need more to satisfy her. And if she's only sucking for a few minutes sometimes, she might just be thirsty and not hungry. You can try giving her something else to drink, like water, or juice if she's old enough. It sounds like she isn't, though, but if she's at least 4 months, she can probably have cereal now. I started mine on cereal at 4 months, although it wasn't until recently that she began really eating better (she's now 8 months). I didn't put the cereal in her milk, as some people do (like pump and mix it if breastfeeding or just mix with formula) because I read that isn't a good idea. You want to establish a sense of eating with the cereal, and not have them associate it with drinking. I have signed up for various newsletters that send me information every month about my baby's age. One was at Nestle, one at pampers, and one at huggies I think. They provide a lot of good information about things like this and answer a lot of questions. Hope this helps.