In Singapore, Respiratory Syncytial Virus (RSV) does not arrive with a clear warning season. It circulates quietly throughout the year, which means infants may encounter it at any time be it at home, in childcare, or through close contact with family members.
RSV is frequently identified in children who seek medical care for respiratory symptoms. What makes it challenging for parents is that it often begins like an ordinary cold. A runny nose or mild cough may not seem concerning at first. Yet in younger infants, the same infection can sometimes affect the lower airways and lead to breathing difficulties.
Understanding RSV symptoms in babies, how the virus spreads, and what RSV immunisation options are available in Singapore helps parents respond early and reduce the risk of severe respiratory illness in children.
RSV is extremely common in early childhood. Although RSV infects people of all ages, infants and young children are more vulnerable to complications. While many RSV infections begin with mild cold-like symptoms, the virus can sometimes move beyond the upper airways and affect the lungs, leading to bronchiolitis in some severe cases, pneumonia.
Research indicates that by the age of two, approximately 9 out of 10 children will have had at least one RSV infection. During a child’s first infection, up to four in ten may develop infection of the lower airways, particularly younger babies.
RSV is recognised globally as one of the leading causes of lower respiratory tract infections and hospitalisation in infants and young children. This highlights the importance of recognising early symptoms and understanding which children may be at higher risk.
Infants and toddlers are more vulnerable to RSV complications because their airways are smaller and more easily narrowed by inflammation and mucus. RSV is the most common cause of viral bronchiolitis, which is a lower respiratory tract infection that causes inflammation and obstruction of the small airways. In more severe cases, pneumonia may develop.
While many RSV infections are mild and self-limiting, babies under six months are more likely to require medical review if breathing becomes laboured or feeding is affected. In Singapore, RSV contributes to a significant proportion of hospitalisations for acute lower respiratory infections in young children.
While RSV can affect any child, certain groups are at higher risk of developing more serious illness:
Children in these groups may require closer monitoring if infected, as they are more likely to develop lower respiratory tract involvement.
RSV spreads easily through close contact. The RSV virus is present in respiratory secretions and children may become infected through:
The virus can survive on hard surfaces for several hours, increasing the risk of indirect transmission. Because infants require close contact for feeding and care, complete avoidance is often not practical, which makes prevention strategies especially important.
RSV infection in infants often begins in a way that looks like a common cold. For many babies, the illness remains mild and improves with time and supportive care. However, because infants have smaller airways, symptoms can sometimes progress.
Early symptoms may include:
At this stage, most infants remain alert and are still able to feed reasonably well.
In some infants, RSV can spread to the lower airways and lead to bronchiolitis, an inflammation of the small airways in the lungs. This can make breathing more effortful.
Signs of more serious respiratory infection include:
Not every infant will develop severe symptoms. However, babies under six months are more vulnerable. If your baby is breathing rapidly, appears distressed, or is feeding poorly, it is best to have your child assessed by a paediatrician.
While RSV exposure cannot always be avoided, practical steps can help reduce the risk of infection, particularly for infants.
Simple preventive measures include:
These measures do not eliminate the risk entirely, but they help lower the chance of transmission.
RSV immunisation is not part of Singapore’s routine national childhood vaccination schedule. However, protective options may be available depending on the infant’s age and medical risk factors.
In Singapore, protection against RSV may be provided in two ways.
RSV immunisation and antibody protection aim to reduce the risk of severe respiratory illness and hospitalisation.. It does not completely prevent infection, but it can lower the likelihood of complications.
Parents who are considering RSV protection for their children should consult a healthcare professional to determine whether it is appropriate for their child.
Keeping track of childhood vaccinations can feel overwhelming. With different vaccine names, schedules and recommended timings, it is completely normal to feel unsure about what comes next.
You do not have to figure it out on your own. Our paediatricians at SBCC Baby & Child Clinic provide personalised guidance based on your child’s age, vaccination history, health needs and daily environment.
Whether you are visiting for routine check-ups or seeking advice on childhood vaccinations, we are here to help you make informed decisions with confidence and peace of mind.
Mild RSV symptoms usually improve within one to two weeks. Cough may persist slightly longer.
Most RSV infections are mild. However, babies under six months and those with underlying conditions are at higher risk of bronchiolitis and hospitalisation.
No. RSV immunisation is not routinely given to all infants. It is considered for babies at higher risk. A paediatrician can assess suitability.
No. RSV and influenza are different viruses. However, both can cause respiratory illness in children.
Medically Reviewed by Dr Stephanie Hii
Consultant Paediatrician