Multivitamin supplementation during pregnancy may improve a baby's birth weight more than iron-folic acid supplementation alone ...
In an analysis of 13 studies, women who received a multivitamin had a 17% greater reduction in the risk of having a baby with low birth weight (RR 0.83 ...)
... Overall birth weight was significantly higher in the multivitamin group than in the iron-folic acid group (difference 54 g), but there was no significant difference compared with placebo.
There were no significant differences between the three study groups in the risk of preterm birth, small-for-gestational-age birth, or gestational age.