J.S.
I've been taking 2 flinstones each day since my first pregnancy in 2005. Found that the majority of my "morning sickness" was actually side effects of the prenatal vitamins. My OB suggested the flinstone chewables, I thought he was joking, but voila! no more nausea! Took them until shortly before son's 1st birthday when I stopped breastfeeding, started back 5 weeks later when I found out I was pregnant again :-)
My new OB (we had moved) gave me samples of several different prenates. Long story short, flinstones rule!
P.S. - also VERY easy to get my now 3 yr old to take his vitamin every morning, since Mama is taking it, too!
Good luck!