My lovely chirpy 9.5 month old has had a few days of being off colour. He is eating but not as much as normal. He is sleeping fine both at night and naps during the day. He is grumpy and doesn't want to be put down on the floor to play. He is not really enjoying his normal activities. He hasn't got any teeth yet but I can see a white ridge at the bottom front two teeth. How long does teething last for until the teeth come through ? Or does this sound like a phase of separation anxiety ? He has had no big changes recently. Just wondering if there is anything I can do ?