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I'd guess dark but I am not sure either.As I know you can also use brown sugar (dark is best) mixed in some water, about 1 tsp in 2 ounces of water. Another thing you can try too is boiling some raisins in a just enough water to cover then give the water to babe. Help this helps I know baby constipation is difficult on baby and mom.
I just had my son in December and although I have yet to try it I was told it was the light syrup to mix in with water to help with the constipation