If the snake has eaten consecutively 5 times, in other words being well started it's really what matters with animal that young. Of course what matters too is that you are capable to offer an environment that will provide the security and general husbandry needed for the snake to continue to be a good feeder.
To give you an idea they hatch between 55 and 75 grams on average (sometime smaller sometime bigger) and get their first meal offered 10 to 14 days after they hatch (does not mean all will eat that first meal first time offered).