They all grow at a different rate and many factors are involved such as the individual itself, prey size, feeding frequency, whether or not the animal fast or eat with consistency etc.
Most important is that the animal is healthy and has a good body weight
Though 400 grams at that age is on the runt side.
If being fed appropriate size prey weekly and the animal is not putting on weight than I would recommend to have a fecal done.
If not fed appropriate size prey I would recommend feeding the right size and having an heavier feeding schedule for a while.
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