He isn't being picky, he just isn't hungry. Back off to offering every two weeks while it's still winter and he'll pick back up eventually. Just keep monitoring his weight like you are doing.
BTW - kudos for watching his weight already. It's frustrating the number of people that post wanting to know if they should worry about a noneater, but "haven't had time/money/whatever" in the two months (or more) of ownership to go buy a $20 scale! (rant over)
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