Eating like a newborn

Falon
About 2-3wks ago I noticed my lil girl was eating every 2hrs and waking 3-4x at night. For almost 2mos she had been eating every 3-4hrs and waking 2-3x at night (not every night but for the most part). Her 2 bottom teeth came out so I figured she wasn't eating but soothing her gums. Now they're out and for the past 2-3days she's been eating every 1-2hrs even at night. 
She was doing so well and I thought we were on the right track but now I have a newborn all over again. Any ideas why this is happening and/or what I can do about it??