Weight gain

So my baby girl seems to be gaining weight super fast still. I thought it slowed down by now. We breast feed and supplement with formula and do food three times a day. When she was sick last week we took her to the doctor and she weighed 19lbs (7 months old) three weeks earlier she weighed 17.5lbs. They said wow you probably don’t have to supplement with so much formula. Now I feel like I have been over feeding her. She will eat tons of food and never stops and same with milk just drinks. It’s so hard cause when she was born she struggled so much with her weight and the started mentioning failure to thrive. So maybe I have over compensated. I don’t want to over feed her though and now I am all stressed that she is gaining to much weight. Anyone else ever deal with this.