Above all, be patient. Baby snakes grow slowly anyway- and they often don't appear to put on any weight because they get just a tiny bit longer at the same time, so it doesn't show in their width. Also, many breeders deliberately feed their young snakes a bit "light" so they don't grow too fast while waiting to be sold. He'll catch up in time- & remember that in the wild, he likely would have had even LESS to eat during that time.
Even if your snake is off to a somewhat slow start, don't worry about it, & don't over-feed him trying to hurry his growth. Remember that snakes normally still act hungry after they've just eaten (for hours up to a day+), & it's best if you learn to ignore that- otherwise you may find yourself cleaning up a regurgitated meal one of these days. Just like kids, snakes are only small for a while- their growth is subtle- be patient, & enjoy his small size while it lasts.
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