Split up from nose during sleep

My baby split up from nose during her sleep. The problem is her last feed was 2 hours ago. The split up from nose was little but baby did wake up and make some discomfort sound. Is this normal?

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she is 7 weeks old and doing bottle fed. Did burp once after 10 min and 20 min upright. Its happen 2nd time so a bit concern if this is normal.