Sleep Regression/Teething/Growth Spurt?

After we returned from the Boston/Maine trip, I expected Jack to be a little out of sorts, and to possibly be a little difficult for a few days until we got back into our "routine".  Not that we have much of a routine, we pretty much go by Jack's mood.  I had also decided we were going to establish more of a routine.  Boy was I wrong...

Jack has slept through the night since 6 weeks.  I know, I'm lucky.  But, I got used to that.  Suddenly he is waking up in the middle of the night.  Absolutely hysterical.  I tried letting him cry it out the first night, it was heart breaking and I went in after 5 minutes, because he really wasn't calming down at all.  For the past week he has been waking up at various times during the night.  Not at a specific time, so I know he hasn't developed a new schedule.  He's been very difficult during the day.  Crying/clingy.  It's just not normal for him.

So I Googled it.  I came to the conclusion he had reached the "5 month wakeful period", don't ask me what it is.  I can't explain it, all I really gathered is that for no reason whatsoever babies go through a period of time around 5 months where they go through a sleep regression.  There are all kinds of things to try to sleep train, and various methods.  I decided to just hope he grew out of it sooner rather than later.

Or perhaps he is teething?

I was exhausted last night, so I made up a bottle and handed Jack and the bottle to Craig.  Jack ate all 8 oz. And it dawns on me, the kid is going through a growth spurt.  It only took me a week to realize it.  That he is in fact STARVING, mother of the year award here I come.

I did get Jack's 3 month pictures professionally taken... Yea, yea, I'm just now getting around to getting them ordered.  Here are some of my favorites.