Someone I know told me (they work with informing parents on parenting things) that there is no research to show that babies should be weaned exclusively at 6mths. WHO give the guidelines and the UK just adopt the same thought, which is why HVs say you can wean from 17wks.
This has thoroughly confused me, does anyone know what she might mean?? Wish I had the chance to ask more about this as it had me curious.