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I find your question about sitting up puzzling. Do you mean that your daughter has regressed and is no longer able to do what she did previously? Has she had an illness in the meantime? Is she still developing in other ways - her ability to communicate for instance? Is she growing at a normal rate? I think this problem is one that you should take to a pediatrician. If you have photographs or film of your daughter sitting and walking take these with you so that the doctor can see clearly what the differences now are. Write down questions you have before the consultation if necessary. I hope that quite soon you will be able to get to the bottom of the problem.