It appears that your 4 year old is being repeatedly infected with pinworms.Pinworms are always carried by humans and not animals, so it could be another child or person at the school your child attends who is passing the eggs of the pinworms to your child.These eggs can also occur in sand pits.Your child needs to be given another single dose of Vermox syrup.Your 3 month old is very unlikely to be infected.
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