Most Helpful Guy
I think for right now you shouldn't worry :) , he is clearly busy with his son and maybe just had 15 minutes of his day to check Facebook (another thing to note is sometimes Facebook lies and says people are online when in reality the Facebook app is just running on their phones) anyway, wait a few more days and if he doesn't contact you first, casually contact him again. He told u he had a good time so dont worry about it for now.
Most Helpful Girl
Well it's been a couple of days since he hasn't texted, I personally take that as a bad sign...