I don't suppose its a problem if very watered down/milky. But I've read in several places that the tannin in tea can cause problems with absorption of iron for some babies. We have given it to LO once previously. A friend gives tea to her LO regularly (very milky though)
You're right, the tannin does weaken iron absorption in everyone, not just babies, so it's not great to give to little ones when they're growing.
I suppose if it was very weak and milky and was given to them away from meal times it wouldn't hurt, but I can't see them getting a huge amount of benefit from it either. I was given it as a child but the caffeine sent me up the wall, Mum said she used to have to peel me off the ceiling after tea or chocolate. I've also had a lifetime of anaemia, which I'm not at all saying is related but it's something to think about.
When my LO is older I would give her some if she was curious but personally I wouldn't give it to a baby.
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