I agree with Noelle. If you lo is content, and still taking a full feed at your current feeding schedule, then she must be hungry then. She wouldn't eat it, or at least not all of it, if she weren't hungry. My dd didn't move to 4 hrs until 5 months. At that time, she started increasing her A time and shifted her naps until one of the naps went past a feeding time. Therefore, I dropped that feeding, shifted the others around a bit, and she was more at a 4 hrly feeding cycle.