It is normal for babies to fidget when sleeping. Mine too!!!
Generally babies have shorter sleep cycles than adults and their sleep patterns change as they grow. Infants first enter a phase of light sleep that is longer than one that an adult typically experiences.
Your baby may not have reached deep sleep even after she appeared to be sleeping for a while. She will be likely awaken every few hours and move about before falling asleep again.
Not to worried. If she is well fed and burped, should be fine.
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