3 month old sleeping a lot?

Okay so the past few days I’ve noticed my baby girl is sleeping A LOT! She’s sleeping 12 hours straight through the night. Wakes up around 7-8 ish then eats 2 bottle within a 2-3 hour span then she fell asleep for short (20-45 minutes) every now and then, ate then fell asleep at 4 and slept until 6pm and then she ate and instantly fell back asleep. Is there a reason she’s sleeping so much? Growth spurt?? I also feel like she’s not eating as much too.