Hi before one year old solids is not a replacement for milk and hence it is ok if they occasionally don't eat solids. However after one year old solids should start to be the staple food for them gradually. If he is having sore gums, you may wanna give him some comfort food like ABC soup or something softer or cooling like yoghurt? At least he still takes in some nutrients from solids. But if he really doesn't want to eat solids I think it is ok to skip for a few days rather than make him scared of eating.
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Third one coming...