2.5 month old sudden change in sleeping and feeding patterns

For the past 5-6 days, LO has suddenly been waking up crying after very short naps (less than 30 minutes) or almost right after putting her down. She still sleeps well at night though. We figured she just wants to be carried since she's been taking her usual 100ml feeds every three hours or so. For the past 24 hours though, LO suddenly drinks only 50-60ml per feed on average. This time, she either sleeps (way) past her usual feeding time, or still has those super-short naps and wake up crying. Is this typical of a growth spurt? Or is this something to worry about?