More medical care is needed for infants and young children.
Literal
Infant-young-children [against-に対する] medical-care [subject-が] more is-needed-[である].
乳幼児 ('infants and young children,' a formal medical/policy compound: 乳児 'infant' + 幼児 'young child'). 医療 ('medical care / medicine' as a system). に対する marks the target of the medical care. である is formal.