Is sunscreen safe for my baby?

The verdict

It depends on age, and the six-month line is where the authorities stop agreeing.

Under six months, the primary answer everywhere is not sunscreen but avoidance. The NHS says babies under 6 months old should be kept out of direct sunlight. The CDC says sunscreen is not recommended for babies who are 6 months old or younger, and that the FDA recommends keeping infants out of the sun during midday and using protective clothing if they have to be in the sun. Health Canada says to keep babies out of the sun and heat as much as possible, because they are much more sensitive to the sun than adults, and to ask your health care provider about using sunscreens on babies who are under 6 months old.

The AAP is the outlier and the most practical. For babies younger than 6 months, it says: use sunscreen on small areas of the body, such as the face, if protective clothing and shade are not available.

From six months, everyone agrees. The NHS says apply a sunscreen with an SPF of at least 30, protecting against both UVA and UVB. The AAP says apply to all areas of the body but be careful around the eyes. Health Canada says use a broad-spectrum, water resistant sunscreen with an SPF of at least 30 when the UV index is 3 or higher.

Why babies are treated differently

Infant skin is thinner, has less melanin and a larger surface area relative to body weight, so both UV penetration and topical absorption are proportionally higher than in an adult. That is the reason the default answer for a newborn is to remove them from the sun rather than to coat them in a product.

It is not that sunscreen is known to be harmful to a small baby. It is that shade and a long-sleeved sleepsuit achieve better protection with nothing absorbed at all, and a baby under six months has no reason to be in strong sun for long enough to need more.

The AAP's carve-out is a recognition that real life intervenes. If you are caught out, sunscreen on a face is better than a burn on a face.

What to actually do, by age

Birth to six months

Keep them out of direct sunlight. The NHS advises attaching a parasol or sunshade to your baby's pushchair, and gives a warning that catches many parents out: do not cover your baby's pushchair or pram with a blanket, because it could lead to overheating. Check on them regularly to make sure they're not getting too hot.

Dress them for it. The NHS says make sure your child wears loose-fitting clothing, sunglasses and a sunhat with a wide brim or a long flap at the back to protect their head, ears and neck from the sun. Health Canada gives the same combination: wide-brimmed sun hats and light, loose-fitting clothing that covers the skin.

Avoid the peak. The NHS names 11am to 3pm as when the sun is at its strongest. Health Canada uses the same window and adds a useful rule of thumb: when your shadow is shorter than you, the sun is very strong.

Six months and over

The NHS: apply a sunscreen with an SPF of at least 30 that also protects against UVA and UVB rays, use plenty and apply it regularly, every 2 hours, and re-apply immediately after swimming or sweating. Its general sun safety page adds that a sunscreen should carry at least 4-star UVA protection.

The AAP: use a broad-spectrum sunscreen with SPF of at least 15, up to SPF 50, noting that SPF 15 or 30 should be fine for most people and that more research is needed to test whether above SPF 50 offers extra protection. Put sunscreen on 15 to 30 minutes before going outdoors, because it needs time to absorb, and reapply every 2 hours and after swimming, sweating or drying off with a towel.

The CDC's numbers are similar: broad-spectrum, SPF 15 or higher, a thick layer on all exposed skin, reapply after 2 hours in the sun and after swimming, sweating or towelling off. It also notes that sunscreen without an expiration date has a shelf life of no more than 3 years, and shorter if it has been stored hot, which matters for the bottle that has lived in the car since last summer.

The AAP has two useful product notes: for sensitive areas such as the nose, cheeks, tops of the ears and shoulders, choose a sunscreen with zinc oxide or titanium dioxide; and if possible avoid the ingredient oxybenzone because of concerns about mild hormonal properties, while remembering that using any sunscreen is better than not using sunscreen at all.

Sunburn in a baby is a medical call

The AAP is unambiguous: if your baby is younger than 1 year old and gets sunburn, call your doctor right away. For older children, call if there is blistering or pain. That is a lower threshold than most parents apply, and worth knowing before you need it.

The NHS reminds parents that up to 80% of the sun's UV rays can get through clouds, and that UV bounces back from water, sand, snow and concrete. A cloudy day at the beach is not a day off.

Vitamin D is a separate question

Keeping a baby out of the sun does not mean accepting a vitamin D shortfall, because the UK does not rely on sunlight for infant vitamin D at all. NHS guidance is that all children under 5 are advised to take vitamin D supplements, and breastfed babies from birth should be given a daily supplement. Health Canada recommends a daily vitamin D supplement of 10 micrograms, 400 IU, for young children who are breastfed or receiving breastmilk, and says a supplement is no longer recommended after two years of age.

Sun exposure is not the recommended route to vitamin D at any age in any of these countries.

Where guidance genuinely differs

Under six months, three different answers. The NHS says sunscreen is not recommended for babies under 6 months. The CDC says the same, adding the FDA's clothing-and-shade advice. The AAP explicitly permits sunscreen on small areas such as the face when protective clothing and shade are not available. Health Canada takes a fourth route and refers the decision to a clinician: ask your health care provider about using sunscreens on babies who are under 6 months old.

The SPF floor differs. The NHS and Health Canada both say at least SPF 30. The AAP and CDC both say at least SPF 15. In practice the higher figure is the safer default, and nothing in AAP or CDC guidance argues against SPF 30.

Only the UK publishes a UVA star rating. The NHS asks for at least 4-star UVA protection alongside the SPF number, a labelling system that does not exist on US or Canadian products, where the equivalent claim is broad-spectrum.

Only Canada ties sunscreen to a UV index threshold. Health Canada's trigger is a UV index of 3 or higher, at which point it advises protective clothing, sunglasses and sunscreen even when it's cloudy. UK and US advice is framed by time of day and season instead.

The reading that satisfies all four: under six months, shade, a hat and long sleeves, with a little sunscreen on the face only if you are stuck. From six months, broad-spectrum SPF30 or higher with 4-star UVA where the label offers it, applied generously, reapplied every two hours, and still alongside shade and clothing rather than instead of them.