It couldn't be dehydration, right?

My son is getting over RSV. He's MUCH better today than he has been (if you've read my frantic posts..)Monday and Tuesday, while in the hospital, he didn't hardly eat. Maybe a few ounces a day. He has thrown up a few times from coughing. Starting Tuesday, he began drinking pedialyte with his formula and even just plain pedialyte. We got released yesterday so I picked some up and he's been drinking at least an ounce after every bottle of milk. Today, he has picked up on eating. 4 ounces here, another 2 there, and then 3, and then 2...etc. It's not as often and as routine as before, but he's definitely still drinking.

He has had at least 5 pee diapers every day and 1poop, even though it was a little runny earlier..

But..I noticed earlier his soft spot looked a little sunken in and I heard it's a sign of dehydration.

He might be a little dehydrated, but if he's had 5 wet diapers, that's pretty good for an ill baby. I'd just keep an eye on him.