Children who take ibuprofen could suffer serious bleeding as a side effect. The bleeding could be set off in the stomach, or existing ulcers in the stomach could be worsened by taking the drug. It's unlikely that one dose will harm your baby, but taking ibuprofen (Advil and Motrin) is generally not recommended when you're pregnant, especially during the third trimester. Ibuprofen is a medicine available in a number of countries worldwide. A list of US medications equivalent to Ibuprofen is available on the Drugs.com website. Don’t give ibuprofen to a baby under 6 months without a doctor’s approval. Shake well before measuring. Use the measuring device that comes with the medicine. Ibuprofen is an medicine used to manage mild to moderate pain, fever, inflammation, menstrual cramps, and types of arthritis. Common side effects are drowsiness, nausea, diarrhea, constipation, and ringing in the ears. Ibuprofen is an NSAID, which can cause stomach ulcers in some people. It also interacts with many other drugs. Taking ibuprofen during the last 3 months of pregnancy may harm the unborn baby. Do not use this medicine without a doctor's advice if you are pregnant. It is not known whether ibuprofen passes into breast milk or if it could affect a nursing baby. When to Give Baby Ibuprofen Ibuprofen is approved for babies 6 months and up—but that doesn’t mean it’s always helpful. Here’s what you need to know. You don’t have to be an experienced mom to know about baby acetaminophen (aka Infants’ Tylenol). You can give your baby infant paracetamol from two months, as long as she was born after 37 weeks and weighs more than 4kg (9lb). You can give her infant ibuprofen if she's three months or older, and weighs at least 5kg (11lb). For example, both acetaminophen and ibuprofen treat pain and fever. Knowing what makes a medicine work and what it does can also help you avoid giving your child two medicines that do the same thing. Ibuprofen shouldn't be used when you're 30 or more weeks pregnant, unless it's on the advice of a doctor. This is because taking ibuprofen at this stage of pregnancy is associated with an increased risk of complications, including a heart problem in your baby and a reduced amount of amniotic.