I just had a look at the BBC article and note that these 'statistics' were put together from comments made by the breastfeeding mothers themselves, i.e. what they thought of their own children's behaviour at five years old. This is not a medical study and there is no medical study in existence that proves beyond doubt that breastfeeding has any effect whatsoever on the outcome of childhood allergies, asthma, intelligence or any other claims peddled out ad naseaum by the likes of the NCT, etc. as 'fact'. I bottle fed both my children by choice and they are now 5 and 7. We are constantly being told how polite, helpful, kind and well behaved they are by friends and family and at their last parents evening we were told they are both "extremely bright", well ahead of where they should be in the curriculum and that they could both "be held up as examples to other children" in terms of their behaviour. They are not perfect by any means (especially at home!!) but they are good kids because this is the way we have brought them up, not because they were breast or bottle fed! A mother who breast feeds can be depressed, detached, nervous, angry, scared etc. and not be bonding with her baby in exactly the same way a bottle-feeding Mum can be looking into her babies' eyes, speaking softly to it, stroking its head, etc and be really enjoying the whole experience. It's the manner in which a baby is fed that helps the bonding process, not whether the milk comes out of a bottle or a breast. Speaking as a student at The Tavistock in London, I can say with confidence that the real issue parents should spend their time worrying about is whether they are both forming a strong, positive attachment with their baby in the first year of life and this is done in many ways, but critically by responding effectively to the babies' physical needs and 'containing' them emotionally. This is what truly lays down the foundations for a mentally and emotionally healthy childhood and adult life, and that HAS been proven medically.