12.79 lbs at three months is fine. The child should not be humpty. A good weight is must, not under or over. If she had a fever, the most common is viral fever characterized by fever and nasal discharge with or without mild cough, and child will be active otherwise. If she does not have all these features, it could be other infection also, for that we need to discuss by direct conversation.
1. If it looks like viral fever, give her only Paracetamol syrup 4 ml three times a day along with frequent breastfeeding and monitoring of the temperature.
2. Give her breastfeed exclusively up to six months.
3. After six months start on cereal supplements, and report with weight so that we can decide how much to be given.
4. Complete vaccination.
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