7 month old having a hard time staying awake?

Lately my LO has been super tired. He’s having a hard time staying awake longer than 2.5 hours during the day and will usually start showing signs that he’s ready for a nap after only 1.5 hours of being awake. Could this be a growth spurt? He’s not eating more- actually a bit less than usual. That used to be my indicator of a growth spurt so this is throwing me for a curveball.

The only time where he’s ok to stay up more than 2.5 hours is after his last nap which usually ends at about 4-4:15; then he’s off to bed around 7-7:30.

Anyone else’s LO doing something similar?