Cage aggression from feeding inside the enclosure is a complete myth... The fact that you open his enclosure many more times in comparison to clean his cage, sometimes to take him out, sometimes to refill water, etc. is evidence enough that he won't associate "opening the tub" to food at all.
You can take a gander at this article for all the details on why feeding outside the cage is not beneficial at all, but only potential harm/risk: http://www.arbreptiles.com/lastword/snakefeeding.shtml
Also, it's a good idea to get a scale... like someone said, so you can keep close track this time whether your snake is losing or gaining weight. Especially in the first 4 months of a baby ball python, they should be gaining weight pretty fast.
Just to give you an idea, my albino male BP is 6 months old right now and weighs ~430g. He's been eating an appropriate-sized meal once a week. Hatchling ball pythons right out of the egg are usually around 50g~90g.
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