Is an oxygen level of 91 in 3 year old a worry?

Yes, an oxygen level of 91 in a 3 year old is a worry and should be monitored closely. Normal oxygen levels for children are between 95% and 100%. Low oxygen levels, or hypoxemia, can be a sign of serious medical conditions, such as pneumonia, asthma, or a heart defect. It’s important to consult your child’s doctor immediately if you’re measuring their oxygen level below 95%. The doctor will evaluate your child and determine the cause of the low oxygen levels, and provide appropriate treatment or medical advice.