Will Retin-A help with jowls and slight sagging of the face?

I am 21 and recently I’ve noticed my face sagging a little bit. I don’t know if it’s from lack of sleep from my baby keeping me up all night or the fact that I’ve gained 15 pounds from what I was pre-pregnancy. My cheeks look like they are sliding down and I have slight jowls now? Can this be reversed if I lose weight? Or would retin- a help?