Growing? Teething? Adjusting?

Mia has started waking up twice in the middle of the night to eat. She had been waking up just once anywhere between 2:00 and 4:00 and then from between 6:00 and 8:00 for the day. The last two nights, she's woken at midnight and then at 4:00, but has gone back to sleep until 7:30 or 8:00. She also seems to be more restless at night. All of these things are signs of either a growth spurt or possibly teething, but she seems a little young for that. My coworker told me not to feed her. Okay. Someone posted on my Facebook page that she's waking because she knows I will come to her. The baby isn't even four months old. Am I supposed to ignore her? She takes a full bottle and goes right back to sleep, which pretty much tells me that she's hungry. I do let her cry herself to sleep sometimes, obviously going in to comfort her and check on her, so I definitely don't go to her every single time she cries when she's in bed. Needless to say, I'm tired today and I'm hoping that this will pass. My head knows that it will. It also knows that in a few months, I'll be having sleepless nights for some other reason.