Fodd bynnag, ar gyfer cyfran lai o blant â chyflyrau iechyd sy’n bodoli eisoes, mae’r risg o salwch difrifol yn uwch. Mae’r tebygolrwydd o fynd i unedau gofal dwys pediatrig gyda Covid-19 difrifol dros saith gwaith yn fwy ar gyfer babanod a phlant ifanc â chyflyrau meddygol sy’n bodoli eisoes, o gymharu â phlant eraill.
However, for a smaller proportion of children with pre-existing health conditions, the risk of severe illness is greater. The odds of admission to paediatric intensive care units with severe Covid-19 is more than seven times greater for infants and young children with underlying medical conditions compared to children without underlying medical conditions.