Firstly potty training cannot be forced or rushed. Your baby need to show signs that he is ready. For example, lesser wet diaper during his naps, longer duration. Also when he is able to say pee and poo. When he wakes up after each nap, put him on the potty. Every 2 hours after. As for school, you can let them know and they will follow your instructions. However 6 months old is way too young. Id say you may want to wait till he is about 1 year old or so. Each child is different so we need to cater accordingly.
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Mum of a chubby boy