Should I Give Acetaminophen or Ibuprofen for Fever?
The short answer
Acetaminophen (Tylenol) can be used from birth (with doctor guidance for babies under 3 months), while ibuprofen (Motrin/Advil) is only safe after 6 months of age. Both are effective fever reducers. Acetaminophen works for about 4-6 hours and ibuprofen for 6-8 hours. Always dose by weight, not age, and use the measuring device that comes with the medicine.
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By Age
What to expect by age
Only acetaminophen is appropriate for this age group, and it should only be given after consulting your pediatrician. Any fever in a baby under 3 months needs medical evaluation before treating at home. Your doctor may recommend a specific dose based on your baby's exact weight. Never give ibuprofen to a baby under 6 months.
Acetaminophen is the only fever reducer recommended for babies under 6 months. Dose by weight using the syringe provided with the medication. You can give a dose every 4-6 hours as needed, but do not exceed 5 doses in 24 hours. Call your pediatrician if the fever is 102°F or higher or persists more than 24 hours.
Both acetaminophen and ibuprofen are now safe options. Ibuprofen tends to be slightly more effective for higher fevers and lasts longer (6-8 hours vs 4-6 hours). Ibuprofen should be given with food to minimize stomach upset. Your pediatrician can help you decide which is best based on your baby's specific situation.
Either medication works well. Some parents find ibuprofen more effective for teething pain and higher fevers, while acetaminophen may be gentler on the stomach. Always use the weight-based dosing chart and the measuring device that comes with the medicine. Never use a household spoon for dosing.
Both medications continue to be safe and effective at this age. Make sure you are using the correct formulation (infant drops vs children's liquid) as concentrations differ. As your child grows, the dose increases, so recheck the weight-based dosing chart regularly. Store all medications out of reach of children.
What Should You Do?
When to take action
- Your baby's fever comes down within 1-2 hours of giving the appropriate dose of either medication
- Your baby still has a low-grade fever after medication but is acting more comfortable and drinking well
- The fever returns when the medication wears off during an illness, requiring another dose at the appropriate interval
- You are unsure which medication is better for your baby's specific situation or medical history
- Your baby has kidney, liver, or stomach issues that may affect medication choice
- You want to confirm the correct dose for your baby's current weight
- Your baby under 3 months has any fever, or your baby at any age has a fever of 104°F (40°C) or higher that does not respond to medication
- Your baby shows signs of an allergic reaction to the medication such as hives, facial swelling, or difficulty breathing
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Trust your instincts. If something feels wrong, reach out to your pediatrician.
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Related Medical Concerns
Can I Alternate Tylenol and Motrin for My Baby's Fever?
Alternating acetaminophen (Tylenol) and ibuprofen (Motrin) is sometimes recommended by pediatricians for stubborn fevers in babies over 6 months, but it carries a risk of accidental overdosing. If your doctor recommends alternating, give one medication, wait 3 hours, then give the other, and keep a written log of every dose to avoid confusion.
My Baby's Fever Won't Go Down with Medicine
Fever-reducing medicine does not always bring the temperature back to normal, and that is okay. The goal is to improve your baby's comfort, not to reach a specific number. A temperature drop of 1-2 degrees after medication is considered a response. If your baby remains uncomfortable and the fever stays above 104°F despite proper dosing, contact your pediatrician.
Infant Tylenol Dosing Concerns
Infant acetaminophen (Tylenol) is generally safe when dosed correctly by weight. The most important rules are to dose by weight rather than age, use the measuring device that comes with the product, never give more than 5 doses in 24 hours, and always use infant-concentration products for babies. When in doubt, call your pediatrician before giving the first dose - they can give you the exact amount based on your baby's current weight. Never give acetaminophen to babies under 2 months without consulting a doctor first.
Ibuprofen and Acetaminophen Dosing Safety
Acetaminophen (Tylenol) can be given to babies 2 months and older. Ibuprofen (Motrin/Advil) should NOT be given to babies under 6 months. Dosing is based on your child's WEIGHT, not age - always use the dosing syringe that comes with the product and follow the weight-based chart on the packaging. Never give aspirin to children under 18 (risk of Reye syndrome). When in doubt about dosing, call your pediatrician. Alternating acetaminophen and ibuprofen can be effective for fever but increases the risk of dosing errors - only do this under your pediatrician's guidance.
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.
Achondroplasia (Dwarfism) in Babies
Achondroplasia is the most common form of short-limbed dwarfism, affecting about 1 in 15,000 to 40,000 births. It is caused by a mutation in the FGFR3 gene and is usually apparent at birth with characteristic features including short limbs, a larger head, and a prominent forehead. Intelligence is normal. With monitoring for specific complications and supportive care, children with achondroplasia lead full, active, and independent lives.