Infants under two-years-old, suffering from long Covid are more likely to experience trouble sleeping, fussiness, poor appetite, stuffy nose, and cough, while children aged three to five are more likely to have a dry cough and tiredness, according to a new study in the US.

"Children with these symptoms often had worse overall health, lower quality of life, and delays in development," co-first author Tanayott Thaweethai, associate director of biostatistics research and engagement at Massachusetts General Hospital, US, said.

Long Covid refers to symptoms that persist well beyond having recovered from an acute COVID-19 infection.