He's probably just reverting to a state of childlike dependency.
5 seconds sound clip from the Elf (2003) movie soundboard.
You can hear this line at 00:42:23 in the Blu-ray version of the movie.
Quote context
[...]
- Oh. I'm a human raised by humans. Cool.
- So?
- It's a boy. Buddy's your son.
- That's very impossible. You saw that guy out there. He's certifiably insane.
- He's probably just reverting to a state of childlike dependency.
- An elf?
- What he needs is to be nurtured.
- I see.
- So, um, you'd like me to breast-feed him?
- Walter, just bring him home. Introduce him to Emily and Michael.
[...]