what week does third trimester start
Third Trimester Pregnancy. You are probably feeling as if youâve reached a significant milestone by this stage. Getting to the start of your third trimester really is the beginning of the countdown to when you will be having your baby. Officially, the third trimester relates to the weeks between 28 â 40 of gestation. There can be a week or two of variation though, depending on the source. This is the trimester when all of your babyâs organs and systems will be preparing for extra uterine life.