Development leap/Growth Spurt?

Sunny

Amy is 8.5 months old and was on a (sort of) routine. This week its all over the place!! She doesn't want to eat solids but nurses fine. Actually, just wants the boob all the time. She is also back to 3 naps again and gets cranky/tired at around 2hrs mark. She had transitioned to 2 naps with 3-3.5 hr wake window. She also wakes up early though bedtime is same. Is this a development leap? Growth spurt? Teething? She seems her happy self otherwise!