Sweet potatoes didn't constipate DS, but bananas and rice cereal did. Maybe try some prunes, or make his cereal with prune juice instead of water/BM/formula.
I'm waiting for the holy mother explosion over here. We started carrots yesterday. DD hasn't pooped in a few days prior. She was very gassy though yesterday and today. I have heard some children are like this with solids thought.
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Re: Started solids = extra gassy?