hello, i dont think need to start at 3rd trimester cause I only heard that DOM is good during confinement. If you start taking at 3rd trimester, later your baby drunk.. hehe..
btw, I was also curious whether to take DOM during breastfeeding and I found some info from Thomson Medical Center web: Thomson Medical Centre
The no.8 Q&A... It stated that 10 to 15ml should be okay.. BUT it'd be better if you consult your gynae =)