my daughter is 7 months 20 days old. Her weight is 7 kg now. Her birth weight was 3.1 kg. First 6 month she is exclusively breastfeeding. everybody says that she is low weight. But she is active and achieve every milestone at her age. I consulted with the pediatrician. He says that her weight is within normal range and breastfeeding baby is thin comparing to formula feeding baby I worrying about her weight.