Sicky vs Icky - What's the difference?

In informal terms the difference between sicky and icky

is that sicky is sick; vomiting while icky is excessively sentimental.

(en adjective)

(informal) sick; vomiting

* 2011 , Katy Handley, The Right Way, the Wrong Way Or Your Way? (page 43)

Also consider how easy is it to clean with a sicky baby; can all of the cover and straps go in the washing machine or is it wipe clean only?

(er)

(informal) unpleasantly sticky; yucky; disgusting

I stepped in something icky and it smells terrible.

(informal) excessively sentimental