i had gone through your question and understand your concerns. Unfortunately you did not mention how much your child weighs and whether your child has an allergy to ibuprofen or a history of asthma. Because if your child has a history of allergies to ibuprofen dose ingestion should be given an anti-allergic drug. Another case if your child is not allergic because if swallowed ibuprofen about 1/2 tablets. It is still relatively safe for a 17-month-old child weighing about 10-15 kg. Because the usual dose of ibuprofen for a child is 10 mg / kg. so i think you should not worry. The action that needs to be done is give plenty to drink water or milk. If your child has a history of ibuprofen asthma can make the bronchus narrow so be careful. Which need to be worried if there is continuous vomiting, strong stomach pain, and continuous diarrhea. if it happen you should take her to hospital. hope this answers your question. if you have additional quetions or follow up questions then please do not hestitate in writing to us. i will be happy to answer your questions. and i hope your child be fine..