mbachur — The side effects discussed with regard to soy formula are long term, not short term. The studies are somewhat inconclusive and controversial, but there is definitely enough reason for concern to have a chat with your doctor and posek. If your child can’t tolerate milk, there may be no choice. Also if the formula is just a supplement to nursing, it is less of an issue. But soy does contain the hormone estrogen, and a baby who is exclusively formula fed soy formula receives so much it is the same dose of hormones as in a daily birth control pill. How that effects a baby long term is still unclear.
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