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You'll find that your digestive system makes all kinds of noises now that it didn't use to make. In addition, there's a variety of sensations as things work their way through that you didn't probably experience (or pay attention to) before. As I remember, everytime I switched to a different eating stage (liquids to pureed, etc.) the sensations changed some too, or maybe were a little more pronounced. I think that a feeling of needing to burp is quite common, only typically nothing comes of it. Several folks have told me they were pretty far out before they could burp or f&r*. Not the case for me as I can and do both quite easily (TMI???). Just give yourself time to adapt.