When to give a baby chicken
Most pediatricians in the US say to wait until your baby is at least 8 months old before giving them poultry like chicken. This is mostly because they need teeth to chew it properly and the protein can me hard to digest for younger babies.
The recomendation is changing though. European countries and Canada are now recommending meat as one of baby's first foods because of the high iron content. If you do decide to give your 6 month old chicken make sure it is cooked thoroughly and pureed so they can digest it more easily. Try some and wait 3-4 days before giving them any other new foods to see if the protein reacts with their stomachs at all. If it does you may need to wait until they're older to try again.