Awake Time Regression?

[M and N's Mom]

Hello!  My 5 1/2 month old DS is on a 4 hour EASY.  We had gotten to 2 hours awake time (1 3/4 first thing in the morning but he made up for it later in the day with 2 1/4).  This week though, he doesn't want to wait the full 2 hours...he gets fussy at about 1 1/2 hours and is almost overtired by the 2 hour mark.  Is this a common occurrence?  I'm not sure if it is related to a growth spurt or not as I don't see too much change in what he's eating.

Other info: 
BF with 1 tablespoon of fruit/veggies a day
Started rolling a lot recently


Any thoughts are appreciated.  Thanks.

[LŠuren]

I thoughts are that it is due to developmental issues i.e. his rolling.

I am having the same sort of thing at the moment with Calum, he is now recently commando crawling all over the place and walking with us holding his hands. As a result, he is tired quicker with all this added activity - for him it only seems sort term regression until his body gets used to the extra activity.
HTH's

[M and N's Mom]

Thanks!  I hope that's it.  He has generally not been a fussy baby but it this week he has been fussing more than not.  He must be just tired.  Hopefully as he masters the rolling it'll be better (then it will be crawling...pulling up...walking...LOL!)

[HeatherC]

I completely agree with Lauren.  New physical developments often make lo's much more tired.  I will add, though, that my dd's growth spurts usually consisted of more sleep, and rarely more food intake.  So, he may be on the cusp of a growth spurt as well as the extra physical activity.  It should pass soon, and he'll be back on track of increasing his A time.