Summer 2026 baby mosquito protection: the under-6-months rule, and what parents do this week

For a baby under six months, the agencies that publish on the question put barriers before chemicals. ANSES puts covering clothes and a mosquito net first for young children, and says a net works even when it is not insecticide-treated. The American Academy of Pediatrics recommends mosquito netting over baby carriers and strollers. UK guidance from NaTHNaC says DEET repellents are not for babies under two months, who should be protected with covering clothing and nets over cots and prams. The German BfR advises against repellents on children under two and points to insect screens on windows and doors. The practical work for a European parent this summer is the net, the fit, and cutting the breeding sites around the house.

If you only have two minutes, jump to the five rules for the first summer below. For the regulatory detail on each repellent ingredient, see the age-floor section. For the netting class and why the untreated crib canopy is the right anchor, see the product section. The full public-health reasoning on repellent age rules, including the regulatory detail on each active substance, is set out in the AAP, NaTHNaC, ANSES and BfR sources at the end of this article.

Why this is the question for summer 2026

Two things changed in 2025 that make 2026 the season when a new parent cannot rely on the absence of mosquitoes in the home.

First, the Asian tiger mosquito (Aedes albopictus) is now established in 369 regions across 16 European countries, up from 114 regions a decade earlier, per ECDC's World Mosquito Day 2025 review. A study reported by the European Commission's DG Environment on 14 January 2026 found that London, Zagreb, Frankfurt, Paris and Vienna have become climatically suitable for the Asian tiger mosquito, and that Paris, Vienna, Zagreb and other European cities will face a higher risk of dengue, Zika and chikungunya outbreaks as its range expands. The vector is in the suburbs. The vector is in the cities.

Second, the 2025 surveillance season in metropolitan France produced 809 locally acquired chikungunya cases and 30 locally acquired dengue cases, per the Sante publique France report published 6 May 2026. Aedes albopictus had colonised 81 of the 96 metropolitan departments as of 1 January 2025. EpiCentro ISS in Italy recorded its own cluster activity through the 2025 season. The 2026 season is the first time autochthonous transmission has happened in so many European departments in a single year, and the ECDC invasive mosquito maps record additional administrative units with established populations across Europe.

For parents of a young infant, the question is no longer whether mosquitoes will reach the baby's room. They will, in much of southern and central Europe, across most of the warm half of the year. The question is the barrier, and the answer is the same as it has been for twenty years.

Five rules for the first summer with a newborn

1. Barrier first, and no skin-applied repellent on a baby under two months. UK guidance says DEET repellents are not for babies under two months, who instead need covering clothing and a net over the cot or pram (NaTHNaC). ANSES puts covering clothes and a net first for every young child and says an untreated net works for naps and at night (ANSES). The German BfR advises against repellents on children under two altogether (BfR). Oil of lemon eucalyptus carries a stricter floor still: not on children under three years (AAP). For a baby aged two to six months, use a repellent only when covering clothing and a net are not enough, and only a product authorised for the child's age.
2. The barrier is a fine-mesh untreated net over the cot, the pram and the sleep space. A correctly fitted, intact untreated net is the anchor ANSES recommends, including for naps and night. Long-sleeved clothing, socks and full-length sleepsuits do the rest of the work.
3. Treated nets are a separate regulatory class, and they are not for the infant's cot in Europe. A net that carries permethrin is regulated under the EU Biocidal Products Regulation (BPR) and may be WHO-prequalified for malaria-endemic use. That is a different population, a different regulatory class, and a different risk-benefit frame. For a healthy infant in a non-endemic European home, an untreated net is the right anchor.
4. The mesh count and the fit matter more than the brand. A net that is too coarse lets the tiger mosquito through. A net that is loose lets the mosquito in at the tuck. The right net is fine-mesh, intact, and tucked under the mattress or the pram mattress at every use.
5. Cut the breeding sites around the house. Empty the plant saucers, the pet water bowls, the buckets and the gutters once a week. The tiger mosquito breeds in small artificial containers: tyres, barrels, flower vases, drinking troughs and blocked gullies. The net is half the picture. The breeding-site cut is the other half.

The netting class: which net for which infant

The product question is narrower than the marketing aisle suggests. For a baby under six months, the right anchor is an untreated, fine-mesh crib canopy or cot net, with no permethrin, no insecticidal treatment, and no biocidal claim on the label. The class is the answer: untreated, zero-chemical, sized for a cot or a crib, with the mesh count that keeps the tiger mosquito out.

The temptation, especially in a year when the surveillance numbers are stark, is to reach for a treated net because it feels stronger. Three reasons that is the wrong call for a healthy infant in a non-endemic European home:

• Treated nets are built for malaria-endemic regions, not for European nurseries. WHO prequalification assesses vector-control products and their public-health pesticide active ingredients. An untreated net has no active ingredient, so it falls outside that assessment. The list is the right place to look for what to send to a high-transmission setting; it is not the right place to look for what to put over a cot in Lyon, Vienna or Milan.
• Permethrin on a baby net changes the regulatory class. A treated cot net is a biocidal product under Regulation (EU) 528/2012 and a different safety profile follows. The precautionary choice for a baby under six months is the untreated class.
• The barrier does not need a chemistry to work. A fine-mesh, intact, correctly fitted untreated net is real protection. The failure the marketing aisle hides is the wrong mesh, the loose tuck, and the uncertified marketplace net, not the absence of chemistry.

For a cot or a crib, the right anchor is the untreated, fine-mesh, cot-sized crib canopy. For the pram, a separate untreated pram net, also fine-mesh, also without insecticidal treatment. For a playpen, the same principle: untreated, fine-mesh, tucked.

Treated versus untreated, the line parents asked about

This is the question the 2026 surveillance numbers raise most, so the line is worth setting out plainly.

A treated net carries an insecticidal active substance, almost always permethrin in the European context, and is regulated under the EU BPR. A treated net is a biocidal product and carries the appropriate label. Treated nets are public-health tools for malaria-endemic regions and are prequalified by WHO for that use. They are built for households at high daily biting risk, often in settings where the alternative is no net at all.

An untreated net is a physical barrier, with no active substance and no biocidal claim. A correctly fitted, intact untreated net is the right anchor for a healthy infant in a non-endemic European home, and for any household that wants a barrier with zero chemistry on the skin or in the air.

The mistake to avoid is the conflation: a treated net is not automatically safer because it carries a chemistry, and an untreated net is not automatically less protective because it does not. The classification follows the population and the setting. For a baby under six months in Paris, Vienna, Milan, Zagreb or Lyon, the right line is the untreated class.

For the long version of the regulatory detail on each repellent active ingredient, the AAP, NaTHNaC, ANSES and BfR sources at the end of this article cite the official primary documents. For the household-level choice of barrier (cot net, bed net, travel net, treated net), the AAP and ANSES publications set out the same barrier-first logic.

The age floor on each repellent, in one table

This table is for the household with both a baby under six months and an older sibling, or for the household preparing for the next age stage. The floors are public-health guidance.

Source: AAP, NaTHNaC, ANSES, BfR.

A 2026 setup that actually works

The list is short. It is also the list that most European paediatric nurses, when pressed, will give you.

1. Cot or crib. Untreated fine-mesh canopy, tucked under the mattress on all sides. Re-tuck after every nappy change, every feed, every cuddle. The opening must close, and re-close, every single time.
2. Pram and carrycot. Untreated fine-mesh pram net, with an elasticated edge that grips the pram chassis. Do not drape a cloth over the pram for shade and call it protection; the cloth traps heat and the mosquito walks in.
3. Day sleep and evening sleep. Both. The tiger mosquito bites aggressively, usually during the day and preferably outdoors, and the cot or pram net covers the sleeping hours.
4. Clothing. Long sleeves, socks, full-length sleepsuits in light colours. Light colours show the mosquito, and the parent can brush it off before it lands.
5. Breeding sites around the house. Empty the saucers, the buckets, the gutters, the pet bowls, the paddling pool, the tarp that holds a puddle, once a week. The ECDC tiger mosquito factsheet lists tyres, barrels, flower vases and drinking troughs among its breeding containers. The breeding-site cut is half the picture.
6. Window and door screens. Untreated mesh screens on the bedroom window, fitted without gaps, are the second line of defence. They are not a substitute for the cot net; they are a complement to it.

Frequently asked

Is the under-six-months barrier rule really universal?

The agencies that publish on it agree on the order of protection: barriers first. NaTHNaC sets the no-repellent floor at two months; ANSES puts covering clothes and a net first, including an untreated net; the BfR advises against repellents on children under two; and the AAP recommends netting over carriers and strollers and warns against oil of lemon eucalyptus under three years.

Can a plug-in vaporiser or a citronella candle do the job instead?

No. Plug-in vaporisers release a volatile active into the air; the cumulative exposure for a young infant is poorly characterised, and the public-health bodies do not list them as a substitute for the net. Citronella candles have a marginal effect at close laboratory distances and no meaningful effect outdoors. The net is the measure.

What about treated nets for travel to a malaria-endemic country?

That is a different question and a different risk frame. For a household travelling with a young infant to a malaria-endemic country, the public-health guidance shifts, and a treated net, correctly used, becomes part of the answer. UKHSA's TravelHealthPro guidance applies. The under-six-months rule here is for the home in a non-endemic European country, where the untreated class is the right anchor.

Is the under-six-months rule different for a baby with eczema or a skin condition?

The precautionary framing becomes more important, not less. A skin condition is one more reason to keep the chemistry off the skin and the barrier on the cot. The same rule applies; the parents should ask the paediatrician for a personal note if there is any doubt.

What about DEET or picaridin for the parent, with the baby in the same room?

A standard adult use of DEET or picaridin on the parent's skin is acceptable. The baby should still sleep under the net, and the repellent should not be applied to the baby's skin. The rule is about the baby's skin, not the parent's.

The single page to keep

For the under-six-months rule, the right page on the phone is the cot net and the public-health sources above. The AAP, NaTHNaC, ANSES and BfR documents together cover the why and the how. The why is the barrier-first consensus; the how is the net, the fit, and the breeding sites. The rest of the marketing aisle is decoration.

Last updated 24 July 2026.