Nice boa.
That boa could take a larger meal, however, in the title you said first feeding. If that boa is new to you I would feed about the same size meal every two weeks (no sooner but longer would be fine) for a few meals. After you have a few meals down up the size some. A Suriname boa of 4.5 feet would never have a meal sooner than every 2 weeks here and would go without food for at least 3 months during the cooler season.
Over feeding will kill a suriname boa. Underfeeding is near impossible...5 meals a year would be under feeding for a boa that age but even that would probably cause no harm.
Good luck.
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