hair growth slowed down!

I cut my hair last February to my shoulders and by October( 8 months) it was to the top of my boobs, so a good 6 or 7 inches it grew. then I cut it to my shoulders again beginning of November of last year and now (4 months later) it is still only at my shoulders, and has grown maybe an inch if I'm lucky. I kept cutting it because the salon had messed up my ombre highlights and when they redyed my hair blonde it destroyed it so I'm growing it out. I have slowed down with breastfeeding but could that really make that much of a difference in hair growth? I am taking a woman's multi vitamin, I'm taking sugar bear hair gummies and I'm in the middle of my second month but I see no difference in my hair, and I take cod liver oil and fish oil. I also still breastfeed about 3x a day or so. it seems my girls hair may has slowed down growth too? P.S. I do not do anything to damage my hair just the occasional blow dry.