My mom is taking over my baby

I have an energetic, happy 6 month old baby boy! He’s my world. I had a little stint of post part in depression but not to the extent where I would regret my bubbs. Lately it seems my mom is taking over my baby. She even said once jokingly that my son was really her child. I just birthed him. I told her immediately that this wasn’t cool. My mom has been a great help when I’m running errands, cleaning, or working. She watches him when my husband isn’t able to. Lately she’s been staying over at my house to be close to her Dr appointments so that poses a problem too. If he’s crying when I’m finally home and taking care of him she takes it upon herself to try to take him and soothe him. She always critiques my parenting ( you need to feed him more baby food instead of bottles. You guys don’t pay him enough attention.) When I bring up new mile stones, she’ll say things like “yeah he’s been doing that for awhile” or “yeah I taught him that”. Is this all in my head ladies? She makes me feel inferior. I’m in constant fear that my son doesn’t know IM his mom not HER. I KNOW IM BEING DRAMATIC. ugh Sorry for the long post ladies. Please give advise.