That little ball looks quite healthy. I'd feed him once a week whatever he will take. They need feeding at this age as they are growing quite quickly. Once he hits about 800g or so I'd go onto a 10-14 days schedule with him.
Avoid the temptation to overfeed, packing on loads of weight in a short space of time may build up excess fat which may effect his health a few years down the line.
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