Summer With a Baby and Toddler: How to Beat the Heat

For many families, summer brings a special sense of lightheartedness: long days, time outdoors, outings, and vacations. For babies and toddlers, however, high temperatures can be more of a strain than for adults. The reason lies in the fact that a child’s body has not yet fully developed the ability to regulate its own temperature.

While adults can release excess heat through sweating and efficient adjustment of their blood vessels, among other mechanisms, this temperature regulation system is not yet fully functional in babies and young children. Their bodies are more sensitive to heat; they can overheat more quickly and need more support to maintain their thermal balance.

Why Babies Are Particularly Sensitive to Heat

A recent review article from 2025 shows that infants are particularly sensitive to high ambient temperatures due to their unique body physiology and their dependence on caregivers. Body temperature is regulated by the interaction of the brain, nervous system, skin, and metabolism. The hypothalamus—a region of the brain that acts as a kind of temperature control center—plays a central role in this process.

In babies, this system is still developing. They are less able to effectively adjust their body temperature to high outside temperatures. Additionally, infants have a larger skin surface area relative to their body weight than adults. As a result, they absorb heat from the environment more quickly.

Sweating also works differently in young children. Newborns and young infants cannot yet regulate their heat loss through sweat as effectively. Very young babies, children with medical conditions, or children who are in poorly ventilated, warm rooms are therefore particularly at risk.

The Most Important Protection: Preventing Heat Stress Rather Than Just Reacting to It

When temperatures are high, the best strategy is to avoid exposing the body to severe overheating in the first place. The hottest hours of the day, between noon and the afternoon, should be kept as quiet as possible for babies and toddlers.

The early morning hours or late afternoon are more suitable. Rooms should be kept as cool as possible: During the day, closed curtains or blinds help, while windows can be opened during the cooler morning and evening hours.

Direct sunlight should be avoided as much as possible for babies. Infants’ skin is more sensitive and does not yet have the same natural protection as adult skin.

Summer Clothing: Less Is Often More

In warm weather, babies usually don’t need extra layers. Lightweight, breathable clothing made from natural materials like cotton or linen can help dissipate heat more effectively.

A common point of uncertainty is whether babies need a hat. In direct sunlight, light sun protection is advisable, especially for sensitive scalps. In sheltered, shaded areas, however, headwear that’s too warm can also contribute to overheating.

A good indicator is the back of the neck: if it feels pleasantly warm, the temperature is usually just right. A sweaty neck, damp hair, or unusual restlessness can be signs that a child is too warm.

Fluids: Babies Need Special Attention

The body loses fluids due to heat. Young children have fewer reserves and can become dehydrated more quickly.

Breastfed babies often need more frequent feedings in hot weather, as breast milk usually meets their fluid needs well. For infants fed formula, special attention should be paid to their fluid intake.

Toddlers should drink regularly, even if they don’t explicitly ask for it. Water is generally the best choice. Drinks high in sugar aren’t necessary in hot weather.

Signs of dehydration can include fewer wet diapers, dry lips, fatigue, or unusual irritability.

Sleeping in Hot Weather: Creating the Right Environment

Summer heat can also affect the sleep of babies and toddlers. The human body’s internal clock is highly sensitive to light and temperature. Babies, in particular, are still developing their sleep-wake cycle.

A cool, quiet, and darkened room promotes rest. The ideal room temperature is often recommended to be between about 16 and 20 degrees, but more important than a specific number is ensuring that the child is neither cold nor sweating.

Lightweight sleepwear and breathable materials help promote heat dissipation. Additional blankets are usually not necessary in high temperatures.

Car Rides and Strollers: Take Extra Caution

A frequently underestimated risk is heat inside a car. Vehicles can heat up significantly within a short time. Even a brief stay in a parked car can be extremely dangerous for babies and children. Be sure never to leave your child alone!

Similarly, strollers can be problematic in high temperatures. A blanket draped completely over the stroller can reduce air circulation and raise the temperature inside. Sun umbrellas or special breathable sunshades are better options.

Sun Protection: Children’s Skin Needs Special Protection

Babies under one year of age should be kept out of direct sunlight as much as possible. Shade, clothing, and choosing the right time to be outdoors are the most important protective measures.

For older babies and toddlers, appropriate sun protection may be advisable. Additionally, a sun hat, protective clothing, and regular breaks in the shade can help.

Warning Signs of Overheating

Parents should be alert if a child seems unusually tired, listless, or irritable. Hot, dry skin, rapid breathing, vomiting, or noticeable lethargy can also be signs that the body is overwhelmed by the heat. For very young babies or in cases of severe symptoms, seek medical advice immediately!

Activities That Are Good Even in the Heat

Even on hot days, babies and toddlers don’t have to miss out on experiences and physical activity. The key is choosing the right time and an environment where the body isn’t overwhelmed. Activities in the early morning or late afternoon, when temperatures are lower, are particularly pleasant.

Water is one of the most enjoyable activities for many children in the summer. A small water basin, a wading pool in the shade, or a water feature in the garden offer a way to cool off while providing an exciting sensory experience. Babies can explore water with their feet or hands, while toddlers can playfully experiment with cups, small containers, or water toys. Direct supervision is always essential, as even very shallow water can be dangerous for young children.

Spending time in the shade outdoors can also be a great summer activity. Walks in the woods or in parks are often more pleasant than being in open areas, since trees reduce direct sunlight and the air there is often cooler. Gentle walks are ideal for babies, while toddlers can collect natural materials, observe animals, or play simple discovery games.

On particularly hot days, quiet indoor activities are often the better choice. Painting with watercolors, doing paper crafts, reading aloud, making music, or playing simple movement games provide variety without putting additional strain on the body. Sensory games—such as a bowl of water, ice cubes to feel, or various materials to touch—can also be exciting for young children.

Simple summer experiments are also suitable for toddlers: watching ice cubes melt, cutting up fruit and preparing a cold meal together, or going on little “treasure hunts” in the shade. Such activities promote perception, language, and creativity and do not require much physical exertion.

A trip to the lake or the outdoor pool is also possible if a few precautions are taken. Shaded areas, regular breaks, plenty of fluids, and protection from direct sunlight are especially important. The hottest part of the day should be avoided whenever possible.

Summer with Kids: Finding the Right Balance

Heat doesn’t mean families have to avoid summer. With a few adjustments, babies and toddlers can enjoy the warm season just fine. The key is to take into account the unique needs of a child’s body: plenty of fluids, protection from direct sunlight, appropriate clothing, and an environment that’s as cool as possible. Summer is an important time for children to be active, explore, and develop. If parents pay attention to their children’s cues and minimize heat exposure, even the youngest family members can safely get through warm days.