Does your vagina tighten back?

Yes. If you are referring to vaginal tightness after delivering a baby, yes!. The tissues in the vaginal area, with hormonal stimulation are made to stretch for the birth of a baby. By the same reasons, the vaginal area will restore itself to approximately the same state as previous to pregnancy. Birth trauma can alter this but would be rare. Put your mind at ease, give it some time and enjoy.