Quoting Mama2B&M:" Im 25 weeks, due christmas day. When does the 3rd trimester begin? I am excited also, but am incredibly ... [snip!] ... but am incredibly freaked out to be starting over. I have an 8 year old and 9 year old, and it feels like its been a lifetime."third trimester starts from 27 weeks ... ive just got in there, very exciting!!!