My preschooler had swim lessons. Can I relax supervision?

No. Swim lessons can reduce the risk of drowning, but they do not drown-proof a child. A child who can swim can still slip under, panic, or tire. Stay within arm's reach in or near water, and keep one adult assigned to watch with no phone or other distractions. Drowning happens in seconds and is usually silent.

What SPF and how often should I reapply sunscreen?

Use a broad-spectrum sunscreen with an SPF of at least 15 (up to 50); SPF 15 or 30 is enough for most children. Apply 15 to 30 minutes before going outside, then reapply every 2 hours and after swimming, sweating, or toweling off. Seek shade during peak UV from 10 a.m. to 4 p.m. and add a hat and sunglasses.

Is DEET safe for my 3-to-6-year-old, and what concentration?

Yes, used correctly. The AAP says repellent with about 10% DEET protects roughly 2 hours and 30% about 5 hours; concentrations above 50% add nothing, so pick the lowest that covers your time outside. Use it sparingly, and avoid your child's hands, eyes, and mouth. For babies, AAP suggests mosquito netting over carriers and strollers rather than repellent on the skin. Oil of lemon eucalyptus should not be used under age 3. Apply sunscreen first, then repellent.

How do I know if my child has heat stroke versus heat exhaustion?

Heat stroke is an emergency: a high body temperature of 103°F or higher; hot, red, dry, or damp skin; fast, strong pulse; headache; dizziness; nausea; confusion; or loss of consciousness. Call 911, move your child to a cooler place, and use cool cloths or a bath. Heat exhaustion shows heavy sweating; cold, pale, clammy skin; a fast, weak pulse; nausea; cramps; weakness; or fainting — move to a cool spot, loosen clothing, and sip water, but call for help if it worsens or lasts over an hour.

Does my child need a life jacket if we are just at the lake?

Yes. Put a U.S. Coast Guard-approved life jacket on your child in, on, or near natural water and on boats. Water wings, pool noodles, and inflatable toys are not safety devices and can give a false sense of security. Open water also hides drop-offs and currents, so keep supervision even closer than at a pool.

Summer · Preschooler 3–6 yr

Summer Safety for Preschoolers (3-6 Years)

Your 3-to-6-year-old runs faster, climbs higher, and asks for the pool every day. Summer widens what they can reach. This is the season to set the rules that keep water, sun, and heat from turning into an emergency.

Preschoolers want independence and do not yet judge risk. Water is the biggest one: drowning is the leading cause of death for children ages 1-4. Swim lessons help, but they do not drown-proof a child. This guide covers water and swim safety, sun and sunscreen, heat and hydration, bug bites, bike helmets, and hot surfaces — and the signs that mean call 911.

7 min read Summer Updated June 2026

Reviewed against current AAP and CDC guidance

Supervision still comes first

At this age your child can move out of sight in seconds. The single rule that prevents most summer emergencies: an adult is watching, close and undistracted, near water and in heat. Lessons, floaties, and fences reduce risk. None of them replace you.

Water and swim safety

In and near the water

Use touch supervision: stay within arm's reach of your child in or near water, even if they have had lessons.
Name one Water Watcher whose only job is eyes on the kids. No phone, no reading, no alcohol. Rotate every 15-20 minutes so attention does not drift.
Formal swim lessons can reduce drowning risk and can start after the first birthday depending on readiness, but a child who can swim still needs close, constant supervision.
Most drownings in young children happen during non-swim times — AAP reports 69% of drownings in children age 4 and younger happened during non-swim times, when no one expected the child to be in water. Account for every child the moment a pool, lake, or tub is nearby.

Around the pool

Enclose home and shared pools with a four-sided fence at least 4 feet high that fully separates the pool from the house and yard.
Use self-closing, self-latching gates, with the latch out of a child's reach (at least 54 inches from the ground).
Empty wading pools, buckets, and tubs right after use and store them upside down.
Learn CPR. In the minutes before paramedics arrive, it can save a life.

Lakes, rivers, and boats

Put a U.S. Coast Guard-approved life jacket on your child in, on, or near natural water and on boats — not water wings or pool toys.
Open water hides drop-offs, currents, and cold layers. Keep supervision even tighter than at a pool.
Feet-first entry only until you know the water depth.

What swim lessons do and do not do

Sun and sunscreen

Use a broad-spectrum sunscreen with an SPF of at least 15 (up to SPF 50). SPF 15 or 30 is enough for most children.
Apply 15 to 30 minutes before going outside. Reapply every 2 hours, and after swimming, sweating, or toweling off.
Cover easily missed spots: ears, back of the neck, tops of the feet, and the part in the hair.
Add a wide-brim hat (an all-around 3-inch brim), sunglasses with at least 99% UV protection, and tightly woven clothing.
Babies under 6 months should be kept out of direct sun. If shade and clothing are not available, apply a small amount of sunscreen to small areas like the face and backs of the hands. This rule matters if a younger sibling is along.

Bug bites and repellents

Repellent	What AAP says	Age notes
DEET	10% protects about 2 hours; 30% about 5 hours. Above 50% adds no extra protection — pick the lowest concentration that covers your time outside.	Use sparingly on infants. For babies, AAP suggests mosquito netting over carriers and strollers instead of repellent on skin.
Picaridin	An effective alternative to DEET. 20% can protect for several hours.	A reasonable choice for older babies and children.
Oil of lemon eucalyptus / PMD	Plant-based option for older children.	Do not use on children younger than 3 years.
How to apply	Spray on your own hands first, then rub on. Avoid the eyes and mouth.	Do not apply to young children's hands — they put hands in mouth and eyes. Wash skin with soap and water once back indoors.

Bike helmets and hot surfaces

A helmet on every ride — bike, scooter, trike, balance bike — from the very first time. Set it as the rule before it becomes a negotiation.
Fit check: helmet sits level, about two finger-widths above the eyebrows; side straps form a V under each ear; the buckled chin strap leaves room for one finger.
Replace any helmet after a crash, even if it looks fine.
Check playground equipment, metal slides, seatbelt buckles, and car seats with your hand before your child touches them — dark and metal surfaces can burn skin in seconds.
Asphalt, sand, and pool decks get hot enough to hurt bare feet. Keep sandals on.
Never leave a child in a parked car. Interior temperatures climb fast and can be deadly even on a mild day with windows cracked.

Emergency: drowning and heat stroke

WATER: Your child was submerged, is unresponsive, is not breathing, or is gasping/choking after being in water. Start CPR if trained and have someone call 911. After any submersion with trouble breathing, coughing, vomiting, or extreme sleepiness, get medical care even if they seem to recover.
HEAT STROKE — call 911 right away (it is a medical emergency): high body temperature of 103°F or higher; hot, red, dry, or damp skin; fast, strong pulse; headache; dizziness; nausea; confusion; or loss of consciousness. While waiting, move your child to a cooler place and help lower their temperature with cool cloths or a cool bath. Do not give anything to drink if they are confused or not fully awake.
HEAT EXHAUSTION (cool down and watch closely): heavy sweating; cold, pale, and clammy skin; fast, weak pulse; nausea or vomiting; muscle cramps; tiredness or weakness; dizziness; headache; or fainting. Move to a cool place, loosen clothing, apply cool wet cloths, and sip water. Get medical help if symptoms worsen, last over an hour, or your child is vomiting.

Call your pediatrician

A sunburn with blistering, or fever, chills, or pain after sun exposure.
Signs of dehydration: no wet diaper or no urination for many hours, no tears when crying, dry mouth, or unusual sleepiness.
A bite or sting with spreading redness, warmth, or swelling that grows over a day or two, or that came with a tick you could not fully remove.
A rash, hives, or trouble breathing after a sting or new repellent — for breathing trouble or swelling of the face or mouth, call 911 instead.
Repeated heat-related symptoms even after you cool your child down and offer fluids.

A workable summer rhythm

You do not need to track every guideline at once. Front-load the two that prevent the worst outcomes: an undistracted adult near water, and getting out of the heat before your child overheats. Reapply sunscreen on a timer, keep helmets by the door, and put life jackets on before anyone reaches open water. The rest follows.

Quick answers

My preschooler had swim lessons. Can I relax supervision?: No. Swim lessons can reduce the risk of drowning, but they do not drown-proof a child. A child who can swim can still slip under, panic, or tire. Stay within arm's reach in or near water, and keep one adult assigned to watch with no phone or other distractions. Drowning happens in seconds and is usually silent.
What SPF and how often should I reapply sunscreen?: Use a broad-spectrum sunscreen with an SPF of at least 15 (up to 50); SPF 15 or 30 is enough for most children. Apply 15 to 30 minutes before going outside, then reapply every 2 hours and after swimming, sweating, or toweling off. Seek shade during peak UV from 10 a.m. to 4 p.m. and add a hat and sunglasses.
Is DEET safe for my 3-to-6-year-old, and what concentration?: Yes, used correctly. The AAP says repellent with about 10% DEET protects roughly 2 hours and 30% about 5 hours; concentrations above 50% add nothing, so pick the lowest that covers your time outside. Use it sparingly, and avoid your child's hands, eyes, and mouth. For babies, AAP suggests mosquito netting over carriers and strollers rather than repellent on the skin. Oil of lemon eucalyptus should not be used under age 3. Apply sunscreen first, then repellent.
How do I know if my child has heat stroke versus heat exhaustion?: Heat stroke is an emergency: a high body temperature of 103°F or higher; hot, red, dry, or damp skin; fast, strong pulse; headache; dizziness; nausea; confusion; or loss of consciousness. Call 911, move your child to a cooler place, and use cool cloths or a bath. Heat exhaustion shows heavy sweating; cold, pale, clammy skin; a fast, weak pulse; nausea; cramps; weakness; or fainting — move to a cool spot, loosen clothing, and sip water, but call for help if it worsens or lasts over an hour.
Does my child need a life jacket if we are just at the lake?: Yes. Put a U.S. Coast Guard-approved life jacket on your child in, on, or near natural water and on boats. Water wings, pool noodles, and inflatable toys are not safety devices and can give a false sense of security. Open water also hides drop-offs and currents, so keep supervision even closer than at a pool.

Sources & further reading

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This guide reflects current AAP and CDC guidance and is for educational purposes only. It does not constitute medical advice. ParentFlow is a wellness companion — not a substitute for your pediatrician. For any medical concern, contact your healthcare provider.