"sleeping through the night" is defined, I'm pretty sure, as 5-6hours sleep together, not the 8-12 that people hope for!
My DS2 is only 13wo and doesn't have much of a routine but he's falling naturally into one, where he goes to sleep at ~9ish at night, and then I go to bed much later (fool that I am!) and am woken at around 3/4/5am, depending. If he has a feed around midnight, he'll go through til 5/6am (mostly, depends on the weather - I'm in Australia so it's varying between fecking hot and muggy and reasonably cool at the moment).
He's also going through a "klingon" phase - but I reckon that's because he's just wanting to communicate - if I don't make eye contact with him for a while, he'll squawk to get my attention and then beam at me! He's happy for a while in a bouncy recliner, but after a time that's not good enough and he wants to be held.
Really, at this age, their needs are (IMO) so simple, I find it best to just give them what they want. They have no ulterior motive other than survival and comfort - you can't spoil them, I believe.