Hi. From the description of the symptoms it looks like your child has most likely had a relapse. This will be confirmed if the urine protein is 3+ on 3 days. Childhood nephrotic syndrome
is known to relapse and recur frequently. Dietary modifications usually do not work and in fact as the child is growing he needs a nutritious diet. The appropriate thing at this stage would be to consult your pediatric nephrologist
who will most likely restart the medications. The good news is that this disease often quitens down as the child grows older. I wish your son good luck.