The official teaser trailer for The Boss Baby opens to "Stuck in the Middle with You" by Stealers Wheel. We meet a young boy named Tim Templeton who says he has "the greatest parents ever" and that his family of three "was perfect" until "that one fateful day" when his new baby brother arrived.
Once we're introduced to the baby, we see that the family dynamic changes. Everything revolves around the new child and Tim resents him. He says he takes over the whole house and that it's "freaky" how he wears a suit and carries a briefcase.
One night, Tim hears his baby brother talking on the phone. He bursts into his room and discovers that the baby (Alec Baldwin) can speak fluently. When Tim asks him who he really is, he replies, "Let's just say I'm the boss."