Secondhand Smoke Exposure
The short answer
Secondhand smoke is a serious health hazard for babies and children. It increases the risk of SIDS, respiratory infections, ear infections, asthma, and impaired lung development. Thirdhand smoke — the residue that clings to clothes, skin, furniture, and car interiors — also poses risks to babies who are held or who crawl on contaminated surfaces. The AAP strongly recommends that babies never be exposed to tobacco smoke, including vape aerosol. Smoking outside and changing clothes before holding the baby reduces but does not eliminate exposure.
By Age
What to expect by age
Newborns are the most vulnerable to secondhand smoke. Exposure during this period is a significant SIDS risk factor. No level of secondhand smoke exposure is safe for newborns. If anyone in the household smokes, they should do so outdoors, wash hands, and change outer clothing before handling the baby. Ideally, smoking cessation should be pursued.
SIDS risk from smoke exposure remains elevated. Babies exposed to secondhand smoke are more likely to develop bronchiolitis, pneumonia, and ear infections. Ensure the baby's sleep environment is completely smoke-free. Do not allow smoking in the car even with windows open.
As babies become mobile and mouth objects, thirdhand smoke on surfaces, clothing, and furniture becomes an additional concern. Crawling babies are especially exposed to contaminated carpets and floors. Regular cleaning and smoke-free indoor environments are essential.
Toddlers exposed to secondhand smoke have higher rates of asthma, respiratory infections, and ear infections. If you are unable to eliminate smoke exposure entirely, minimize it by ensuring all smoking occurs outdoors, maintaining smoke-free cars and indoor spaces, and cleaning surfaces regularly. Discuss smoking cessation resources with your healthcare provider.
What Should You Do?
When to take action
- You have established a completely smoke-free home and car environment for your baby
- Smokers in the family smoke outdoors and wash hands and change clothes before holding the baby
- You are working toward eliminating all smoke exposure and seeking resources for cessation
- Your baby has no respiratory symptoms and you have minimized exposure as much as possible
- Your baby is frequently exposed to secondhand smoke and is developing recurrent ear infections, coughs, or wheezing
- You are struggling to maintain smoke-free boundaries with family members or household members
- You need support for smoking cessation — your pediatrician can provide resources and referrals
- Your baby is having difficulty breathing — wheezing, rapid breathing, or blue-tinged lips — whether or not it is related to smoke exposure
- Your child has ingested a cigarette, nicotine pouch, vape liquid, or nicotine patch — this is a poisoning emergency, call Poison Control (1-800-222-1222) immediately
Sources
Related Resources
Related Medical Concerns
Air Quality and Baby Health
Babies and young children are more vulnerable to air pollution than adults because they breathe faster, their lungs are still developing, and they spend more time close to the ground where some pollutants concentrate. The EPA recommends keeping babies indoors when the Air Quality Index (AQI) exceeds 100 (orange level). During wildfire smoke events, keep windows closed, use air purifiers with HEPA filters, and monitor your child for coughing, wheezing, or difficulty breathing. Long-term exposure to air pollution can affect lung development.
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.
Achondroplasia (Dwarfism) in Babies
Achondroplasia is the most common form of short-limbed dwarfism, affecting about 1 in 15,000 to 40,000 births. It is caused by a mutation in the FGFR3 gene and is usually apparent at birth with characteristic features including short limbs, a larger head, and a prominent forehead. Intelligence is normal. With monitoring for specific complications and supportive care, children with achondroplasia lead full, active, and independent lives.
Adenoid Hypertrophy and Breathing
Adenoids are lymphoid tissue located behind the nose that help fight infection in young children. When adenoids become enlarged (adenoid hypertrophy), they can block the nasal airway, causing chronic mouth breathing, snoring, nasal speech, and sleep-disordered breathing. Enlarged adenoids are most common between ages 2-7 and are a leading cause of obstructive sleep apnea in young children. Treatment ranges from watchful waiting and nasal steroids to surgical removal (adenoidectomy) if breathing or sleep is significantly affected.
Altitude Sickness in Babies
Babies and toddlers can experience altitude sickness when traveling above 5,000-8,000 feet (1,500-2,500 meters). Symptoms are harder to recognize in infants because they cannot describe how they feel. Watch for unusual fussiness, poor feeding, disrupted sleep, vomiting, and fast breathing. Gradual ascent is the best prevention. Most pediatricians recommend avoiding sleeping at very high altitudes (above 8,000 feet) with infants when possible, and descending immediately if symptoms appear.
Amblyopia (Lazy Eye) Treatment Timing
Amblyopia (lazy eye) is the most common cause of vision loss in children, affecting 2-3% of the population. It occurs when one eye develops weaker vision because the brain favors the other eye. Early detection and treatment are critical because the visual system is most responsive to treatment during early childhood. Treatment is most effective when started before age 7, though improvement is possible at older ages. Treatment options include patching the stronger eye, atropine eye drops, glasses, or a combination.