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Parents want the best for their kids, so your children's health is a priority. Children are still building up their immune system, which naturally makes them more vulnerable to a number of diseases. But it's not always easy to determine what warrants medical attention and what doesn't.

Is having a fever at 6 months old different from having one at 6 years old? How is a fever lasting for three days different from one lasting for five days? These and other examples can be found in our gallery.

Based on a piece from Women's Health, here are a list of symptoms that should never be ignored by parents.

Click through the gallery and be prepared the next time your child develops any of theses symptoms.

▲Wheezing shouldn't be audible, so if your kids are wheezing, take them to the doctor immediately.

▲You should take your kids to the doctor, especially if they have a persistent high fever and are aged between 6 months and 6 years old. This is because they're at higher risk of suffering febrile seizures.

▲Rashes that are spreading or hurt should be checked. If they have a painful rash, it's usually a sign of infection. Diseases such as chickenpox and shingles, for instance, can cause these symptoms.

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This can be a sign of food poisoning. Photos might be helpful for the doctor to make a diagnosis.

▲If they have ear pain that doesn't go away, this may be a sign of infection or even a foreign body in their ear that needs to be removed.

▲The reasons for these symptoms vary. From allergies, to a virus or bacterial infection, children with these symptoms should always be checked.

▲Anything more serious than a mild sore throat should be checked out. This can be a sign of strep throat, mononucleosis, or another infection.

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If your children start doing this suddenly, with no apparent reason, it may be a sign of urinary tract infection.

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If it looks like they're pulling their rib cage in when they breathe, it might be a sign that they're having trouble breathing.

▲Take them to the doctor if they have soda-like pee. Among other things, this may be a sign that there's blood in the urine.

▲If your child is peeing a lot, this may be a sign of a urinary tract infection, or even diabetes.

▲With a decline in children getting vaccinated, should your child develop sudden blisters, take him/her to the doctor immediately.

▲If they have a cut oozing pus, it's red, tender, or swollen, it should always be seen by a doctor.

▲If your kids have had a runny and stuffy nose for over two weeks, you should get it checked by a doctor.

▲Take them to the doctor if their headache doesn't go away with regular over-the-counter painkillers. Be particularly wary if they develop a fever, have neck pain, sensitivity to light, weakness, numbness, or tingling.

▲This combination of symptoms can be triggered by a number of things, including viruses. Your children definitely needs to see a doctor.

▲Look out for thick and white, brown, or discolored discharge. Also, if it smells bad, you should take your child to the doctor.

▲This is usually a sign of infection, so it's important to seek medical advice as soon as possible.

▲Babies this young with a fever should always be checked by a doctor. They won't be able to tell you if it hurts or where it hurts, so a doctor can help.

▲This can be a sign of bacterial infection. Take pictures if possible, as these can help the doctor with the diagnosis.

▲This can be a sign of dehydration or UTI. If your children's pee color doesn't change after they drink more fluids, or if they have pain, take then to the doctor.

▲This combination can be a symptom of a UTI, but it can also be a sign of pneumonia. Don't risk it and take them to the doctor.

▲This can be just a regular bellyache, but pain around the belly button can also indicate the early stage of appendicitis, so it's better to get it checked out.

▲Children can easily become dehydrated so, if for some reason they can't keep fluids down, take them to the doctor.

▲This can be triggered by a number of conditions, including allergies. But it's not normal, if all of a sudden, your kids develop sensitivity to light, so take them to the doctor.

▲While infection is usually the main cause, it can also indicate that your child has put something in their ear and the object has been there for a while.

▲Around three days with high temperature is somewhat normal. So if your child has had a fever for more than five days, it's time to go to the doctor.

▲This can be a sign of heat stroke. Seek medical advice immediately and, according to Women's Health, don't put your child in a cold bath.

▲If your child's poo looks like it has blood, take a picture and show it to the doctor. Some food dyes, for instance, may make feces look red, but it's always better to check with a professional.

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Blood in the urine is not normal. This can be a sign of infection, so get it checked ASAP.

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If your kids have a cut that doesn't stop bleeding after pressure has been applied for a while, or it looks deep, seek medical attention immediately.

▲If it hurts to pee, your kids might have a UTI, so go to the doctor.

▲A purple and bruise-like rash could be a sign of meningitis, so it's important to see a doctor as soon as possible.

▲If a baby's nose is blocked, they can't breath while they eat, so they won't eat.

▲If your child looks extremely sleepy and unusually groggy, it's time to see a doctor.

▲If you kids have unexplained weakness, it is not normal. For instance, acute flaccid myelitis (AFM), a polio-like virus, can cause these symptoms. You should always check with a doctor.

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Anything worse than a mild sunburn should be checked by a doctor. Go see a doctor immediately if the burn is on the face, neck, or chest, and if there are blisters.