Is baby teething?

A

I hate that I can’t tell. But my usually happy baby has been becoming fussier with each growing day. His gums have been white for a while now, but I don’t see anything trying to pop through just yet. But just today he’s been extremely fussy and super sleepy, which is not like him and I’ve noticed his cheeks are starting to get really rosey. Is this teething or could it be something else? He will be six months this week