Baby Motrin Dosage by Weight: Infant Ibuprofen Dosing Chart
Ibuprofen (Motrin/Advil) is only safe for babies 6 months and older. This dosing chart uses the 50mg/1.25mL infant concentration with exact mL amounts by weight.
💊 Infant Ibuprofen Dosing Chart (50mg/1.25mL Concentration)
This chart uses the concentrated infant drops at 50mg per 1.25mL. Check your bottle's label to confirm this concentration before dosing. If you have children's ibuprofen liquid (100mg/5mL), do not use this chart — the concentrations are different.
- 12–17 lbs (5.4–7.7 kg): 1.25 mL (50 mg)
- 18–23 lbs (8.2–10.4 kg): 1.875 mL (75 mg)
- 24–35 lbs (10.9–15.9 kg): 2.5 mL (100 mg)
Give every 6–8 hours as needed. Do not exceed 4 doses in 24 hours. The recommended dose is 5–10 mg per kilogram of body weight per dose.
⚖️ Motrin vs. Tylenol: When to Use Which
Both lower fever and reduce pain, but they work differently. Understanding the difference helps you choose the right one for the situation.
- Ibuprofen (Motrin) is anti-inflammatory. It reduces swelling, which makes it the better choice for teething pain (inflamed gums), ear infections, and injuries where there's swelling.
- Acetaminophen (Tylenol) works on the brain's pain center but does not reduce inflammation. It's the safer option for younger babies (2–6 months) and babies with stomach issues.
- Ibuprofen lasts longer: 6–8 hours vs. 4–6 hours for acetaminophen. This makes it a better option for overnight fever control — one dose at bedtime can cover most of the night.
- For stubborn fevers: You can alternate both (see schedule below), which gives relief every 3 hours without exceeding the safe dose of either drug.
🔄 How to Alternate Motrin and Tylenol
When a single medication isn't bringing the fever down enough, alternating is the most effective approach. Here's the schedule:
- Hour 0: Give acetaminophen (Tylenol) — dosed by weight
- Hour 3: Give ibuprofen (Motrin) — dosed by weight
- Hour 6: Give acetaminophen (Tylenol)
- Hour 9: Give ibuprofen (Motrin)
- Hour 12: Give acetaminophen (Tylenol)
Each individual drug is being given every 6 hours — well within safe limits. But your baby gets fever relief every 3 hours. Track doses carefully. Use a notes app, a whiteboard on the fridge, or text yourself each time.
🚫 When NOT to Give Ibuprofen
Ibuprofen is processed through the kidneys and can affect blood clotting. There are situations where it should be avoided entirely:
- Baby is under 6 months old: The kidneys aren't mature enough to handle ibuprofen safely.
- Baby is dehydrated: Vomiting, diarrhea, or poor fluid intake puts stress on the kidneys. Ibuprofen on top of dehydration can cause acute kidney injury. Use Tylenol instead.
- Baby has chickenpox: Ibuprofen during chickenpox is linked to an increased risk of serious skin infections (necrotizing fasciitis). Use acetaminophen instead.
- Before or after surgery: Ibuprofen affects blood clotting. Your surgeon will advise when it's safe to resume.
- Baby has a known kidney issue: Check with your pediatrician before using any NSAID.
- Baby is on certain medications: Ibuprofen can interact with blood thinners, steroids, and some antibiotics. Always mention all current medications to your pharmacist or doctor.
📏 Measuring the Dose Correctly
Dosing errors are the most common cause of medication problems in children. Small volumes like 1.25 mL and 1.875 mL require precision.
- Always use the syringe that comes with the product. Do not use a syringe from a different medication — markings vary between brands.
- For 1.875 mL: Fill the syringe to the 1.875 mL mark. If your syringe doesn't have that exact marking, fill to halfway between 1.75 mL and 2 mL.
- Never use kitchen spoons. A "teaspoon" from your silverware drawer can hold anywhere from 2 mL to 9 mL — that's a massive range for a baby.
- Aim for the cheek. Squirt the medicine into the pocket between the gum and cheek. This reduces gagging and makes it harder to spit out.
- If you lose the syringe, your pharmacist can give you a replacement oral syringe with the correct markings for free.
☠️ Signs of Ibuprofen Overdose
If you suspect your baby received too much ibuprofen, call Poison Control at 1-800-222-1222 right away.
- Mild overdose: Nausea, vomiting, stomach pain, diarrhea, headache, dizziness
- Serious overdose: Bloody or black stools, vomiting blood, rapid or difficult breathing, seizures, decreased urine output
- Most single accidental overdoses resolve without lasting damage if treated promptly
- Chronic overdosing (giving too much over several days) is more dangerous than a single extra dose — it can quietly damage the kidneys and stomach lining
✅ Quick Dosing Checklist
Run through this before every dose:
- Baby is at least 6 months old
- Baby is not dehydrated (making wet diapers, tears when crying)
- Concentration on the bottle matches 50mg/1.25mL (infant drops)
- Using the syringe that came with this specific product
- At least 6 hours since the last ibuprofen dose
- No more than 3 previous ibuprofen doses in the past 24 hours
- No other ibuprofen-containing products given (check cold medicine labels)
- Dose recorded: time, amount, and drug name