Covering your baby's pram with a dry cloth can increase the temperature by almost 4 degrees. Here's what to do instead

We like to think of babies as tiny versions of ourselves. But babies aren’t simply miniature adults, especially when it comes to coping in the heat. Babies are at greater risk of overheating and need different cooling strategies to those that work for adults.

Parents have long covered prams and strollers with cloth to shade the carriage from the hot sun. However, our recent study showed this can substantially increase temperatures inside the stroller.

After just 20 minutes – the time it takes to go to the shop or drop your child off at daycare – the stroller carriage was 3.7℃ hotter than outside when draped with a dry flannelette cloth and 2.6℃ when draped with dry muslin.

Attaching a battery-operated fan to the stroller wasn’t very effective either at reducing the stroller temperature, cooling the carriage by just 0.1℃ relative to outside.

But dampening the cloth can reduce the temperature in the carriage.

Read more: Top 10 tips to keep cool this summer while protecting your health and your budget

Why are babies vulnerable in the heat?

There are three main reasons why babies might struggle more in hot weather compared to adults.

First, their body shape is very different. Infants have a much greater area of skin surface available to exchange heat with the surrounding environment, compared to their body mass. This means in very hot conditions their body temperature can warm up at a much faster rate.

Second, infants can’t sweat as much as mum or dad and are therefore less able to cool down by sweat evaporation. This is the main physiological disadvantage that places them at greater risk in hot weather.

Finally – and possibly most importantly – babies are almost entirely dependent on someone else to keep them cool. Other than crying, babies can’t communicate that they are too hot. On a hot day, it is the parents who have to check for signs of distress, choose suitable clothing, and make sure shade is found during the hottest part of the day (normally noon to 3pm). Babies can’t do any of this for themselves.

Read more: Curious Kids: What happens in the body when we sweat?

So, what can be done to keep baby strollers cool?

In our same study, we also showed some strategies are really effective at cooling strollers down even on hot and sunny days.

Loosely draping a damp muslin cloth over the stroller reduced the temperature inside the stroller by 3℃.

This cooling effect was even greater when a damp cloth was combined with a clip-on fan, reducing the stroller temperature by 4.7℃ compared with outside.

This method harnesses the power of evaporation. Just like we lose body heat when sweat evaporates from our skin, the evaporation of water from the damp cloth removes heat from the air inside the stroller and lowers the temperature inside.

Using a spray bottle to regularly top-up the water in the cloth every 15-20 minutes will prevent it drying out and increase the amount of time this method will provide cool relief.