This minor variation in weight of asymptomatic baby is not significant . You could have weighed baby with clothes on , with wet duper etc . So you MUST weigh baby naked & with same scale. STOP formula . Why did you start it ?Its NOT needed .exclusive mothers milk .,breast feeding is the Best for baby upto at least six month of age. Enjoy the baby , worry not , keep the baby with clothings removed indi surely for ten minutes to give benefit of
Vitamin D.