。
Has the sick child gotten a bit better?
Literal
Sick [possessive-の] child [topic-は] a-little [topic-は] gotten-better [polite-question-ましたか].
少しはよくなりましたか — 少しは uses は to set 'even a little' as the topic of inquiry, with よくなる meaning 'to get better.' The polite question form makes this a concerned, caring inquiry about a child's health.