DS will be 26 weeks next week (blimey it's gone fast!). I#ve been weaning him for two weeks on veggie purees. He's yet to drop a bottle although he has started to take a little less milk in each bottle. I'm concerned about his depleting iron stores now he's reaching 6 months, esp as I had to take iron tablets during pregnancy because I had low iron myself. Anyway, to get to the point, do I need to change his formula to 'follow on' formula now he's six months? Does this have more iron and will it cause constipation? He currently has Aptamil Hungry baby formula.