My kid is going to be 5 months older and he is on breast fead only and his weight is 6.9 Is this normal?

A. Seemed like a very good weight gain for your child also I must tell you the child should gain at least half a kilo kilogram in a month on that basis if you value it will get to know whether this weight is exactly on the basis of half a kilogram or more than that because in case the weight would be good