The joke here being that Alec Baldwin voices a suit wearing baby who is the new arrival in a family which causes friction with the son Tim, who feels this new intruder is stealing the limelight. Then Tim discovers that this baby can talk as if adult. 

The Boss Baby drops its set up of boy vs baby surprisingly early as the duo semi team up to stop PuppyCo from taking all the love away from youngsters in the eyes of their parents. 

There are a smattering of sight gags and a few funny moments but it’s mid range stuff ultimately. 
A one joke movie in essence but it just about stretches it enough.

‘I need you kid………..no literally, I cannot reach the door handles’