I don't think it's cause for concern. If you're really worried, take him to a vet. But snakes like to stop feeding during cold weather/breeding season and so it's probably nothing. Snakes can go a very long time without food. So unless he's dropping weight, there's nothing to worry about.
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2.3 Red Tail Boa Constrictor (Pan, Andro, Whiskey, Brandy, Morgan)
3.7 Ball Python (Miles, Pudding, Jameson, Daiquiri, Mystery, Lemon Drop, Abita, Sambuca, Hypnotiq, Sin)
0.0.1 Kenyan Sand Boa (Shots)
0.1 Burmese Python (Gwen)
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