Hard to tell but big: Every child is shaped differently, but 48 lbs would be very heavy for a 4 year old (>95th percentile for exactly 4 or ~90th percentile for 4 yr 11 months). How appropriate that weight is depends on her height and body type too. Being able to see the spine isn't necessarily abnormal, but her peds will be able to tell you if you need to be concerned (if it's straight or otherwise, for example).
Answered 5/10/2014
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