My daughter is 16 weeks old and for the past 2 nights, she's been waking up every 2-3 hours. I'm assuming she's hungry because she scarfs down the bottle. She's mostly formula fed (I'm currently going through a relactation process), and I noticed yesterday afternoon she was so hungry at one point that she guzzled down 6oz! She woke up last night at 11PM and this morning 2:15AM, and 5AM. She used to sleep right through the night. Anyone else's kiddo going through this? Do we have a growth spurt on our hands? I also just remembered she took only 2 naps yesterday but they were each about 2-3 hours long.