OK, I've not heard of that! I did some quick research and basically what I've found is that Clomid just stimulates the ovulation hormones, which you already know, but women who need help in this area smoetimes have "environmental" problems - such as where they work (eg dangerous chemicals), or smoking, and THIS leads to low birth weight babies, not the Clomid per say. But PCOS Clomid women who get pregnant don't appear to have any difference in birth weight to other women. In fact, PCOS sometimes leads to high birth weight... could be that the two balance each other out?

There have been studies as to metals like copper and zinc, the effect of Clomid on them and their effect on birth weight, but basically so long as you don't have a big discrepency between your levels and "normal" then there shouldn't be a problem. The difference has to be huuuuuuge for a statistically significant difference though.

More studies have been done with Metformin, as that can be taken well into the pregnancy, and that has not shown any adverse effects; in fact there are some benefits to women taking Metformin in early pregnancy.

Good luck BW and HTH!