Body Changes: Similac

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Constipation in Infants

I have a one month old and his stool is always hard and like little pellets. He was on Enfamil Lipil W/iron. I had alwas heard iron caused constipation but his Dr. said this is untrue. His Dr. switched him to Similac soy 2 days ago. He hasnt had a bowel movement yet, but I read in "What to expect the first year" soy formula leads to peanut allergies down the road. Now What? Does anyone have the same experience and could suggest an alternative formula?