The rectal method is often recommended for infants and young children due to its accuracy. It provides a reliable measurement of core body temperature, which is especially important for newborns and infants whose developing bodies may not regulate temperature as effectively as older children or adults. While the idea of taking a rectal temperature might initially seem intimidating, it is a straightforward process when performed with proper technique. Understanding the correct steps and necessary supplies can help parents feel more confident in monitoring their child’s health.
Gathering Your Supplies
Gathering all necessary items ensures a smooth temperature measurement. A digital rectal thermometer, specifically designed or clearly marked for rectal use, is essential for accuracy in young children. You will also need petroleum jelly or a water-soluble lubricant for comfortable insertion.
Alcohol wipes or soap and water are needed for cleaning the thermometer before and after use. An optional timer can help ensure consistent readings, and a pen and paper are useful for recording the temperature and time. Prepare a comfortable and safe surface for the baby, such as a changing table or a lap.
Step-by-Step Guide
Clean the digital rectal thermometer thoroughly with an alcohol wipe or by washing it with soap and water, then rinse. Apply a small amount of petroleum jelly or water-soluble lubricant to the tip, covering about 1/2 to 1 inch. Position your baby comfortably: on their back with legs bent towards their chest (like during a diaper change), or on their stomach across your lap or a firm surface. If on their stomach, use one hand to keep them steady by placing it on their lower back.
Gently separate their buttocks to expose the anal opening. Carefully insert the lubricated tip of the thermometer into the anal opening. For most infants, insert the thermometer about 1/2 inch to 1 inch, or until the silver tip is no longer visible. Never force the thermometer if you encounter resistance.
Once inserted, hold the thermometer steady. Wait for the thermometer to signal that the reading is complete, usually with a beep or a stable display. After the signal, gently remove the thermometer and read the temperature displayed. Clean the thermometer again with an alcohol wipe or soap and water, then store it appropriately.
Safety and Next Steps
Safety is important when taking a baby’s rectal temperature. Always use a digital thermometer specifically for rectal use and never force the thermometer during insertion. Clean the thermometer before and after each use to maintain hygiene. If your baby is excessively fussy or resisting, pause and try again later.
A rectal temperature of 100.4°F (38°C) or higher is considered a fever in babies. A normal rectal temperature range for infants falls between 97.7°F (36.5°C) and 99.5°F (37.6°C). Recording the temperature and time can help track any changes.
Knowing when to contact a pediatrician is important. For any infant younger than 3 months old with a rectal temperature of 100.4°F (38°C) or higher, seek immediate medical attention.
For babies between 3 and 6 months old, contact a healthcare professional if they have a temperature of 100.4°F (38°C) or higher, especially if they appear sick or the fever exceeds 102.2°F (39°C). If a baby is 6 to 24 months old and has a rectal temperature higher than 100.4°F (38°C) that lasts more than one day, or if they have accompanying symptoms like cold, cough, or diarrhea, a call to the doctor is warranted. Regardless of age, always contact a pediatrician if your baby is difficult to awaken, has a stiff neck, a rash, is crying inconsolably, or shows signs of distress.