Is your child's antibiotic doing its job? According to some experts, too much of good thing could be harmful. Marcie Fraser has more.

The most common antibiotic for kids include penicillin, amoxicillin and augmentin and experts say over the last ten years, there's been a resistance to penicillin for some of the more common bacterial infections like strep. How does this happen? After repeated use of an antibiotics for certain bacteria, the bacteria mutates into a newer, stronger version.

"They are not really out smarting the drugs so much as simply evolving. The only bacterium that survive in our bodies after we take antibiotics are those that are, in theory, for the most part resistant to that antibiotic that we just took," said Dr. Manny Cirenza.

As one antibiotic loses its effectiveness, doctors go to work to create newer drugs. Remember, it's the bacteria that becomes resistant to drugs, not the person.

"It's not the individual child that becomes resistance to the antibiotic, it is merely the bacteria, the infection that they are picking up," said Cirenza

Dr. Cirenza cautions parents to be careful and not use antibiotics when it's not necessary.

"For all of us, we need to be careful not to take antibiotics when we have viral infections because antibiotics will not help that. We should only try to use antibiotics when we absolutely have to," Cirenza said.

When your child is sick and is placed on antibiotics for multiple weeks, don't be afraid to ask your pediatrician questions.

"You have to really question after two to three courses to antibiotics are we really comfortable that we know exactly what we are treating and then are we comfortable that we are taking the right course and doing exactly the right thing," said Cirenza.

Keep your child's immunity high with proper diet, fluids and sleep.

According to Dr. Cirenza, the antibiotic can be made or more or less effective by certain foods you eat.

"Many people are reaching for these yogurts and things like that have natural cultures that may help boost some of the intestinal immunity because those things are going to contain some of the normal bacteria that may help protect your intestinal track against the ravages of that antibiotic," Cirenza said.