2 kids + Distant husband = HELP

So, my husband has been very distant lately. We have 2 beautiful kids 13 months apart with our oldest being 15 months. Here lately he seems like he doesn't want to be around me or he children. And I can't seem to figure out why. We've been married 2 years this coming up January. But have been together since 2010. Now I keep hearing this thing about a "7year itch" where once you've been with the same person so long you'd rather be with someone else. Has anyone ever experienced this? And if so how did you and your SO get through it??