My DS has gone from contented cute little boy to hellbeast in the last week or two. He's definitely teething, which doesn't help (he has a bump on his upper gum so dr says tooth is on its way) but his behaviour/ sleeping has changed too. He has been sleeping through the night for over a month and its recently got up to 9-10 hours in one stretch, but on and off in the last two weeks he has been waking up in the night. Last night he woke up 4 times and when I walked over to his cot he got all excited!
However the two or three nights before that he slept through fine. 
In addition, he is taking less milk- he was taking about 240ml per feed before but now its about 100ml instead. Also he wants attention ALL THE TIME. If he is in his bouncy chair, bumbo or on his playmat (all places he usually plays on his own for a bit while I do housework) he wants me to bounce him up and down, or make him laugh, and keeps griping til I do so.
I've heard that 4.5 months can be a grotty time and that development can mean babies get very excited about their newfound power of making mummy come over etc, but has anybody else experienced all of this, and if so how long can I expect it to last? And is there anything I can do?
I miss my happy little boy with regular eat/play/sleep routine!