Your young'un? What young'un, may I enquire? Ask, even.
4 seconds sound clip from Snagglepuss - Diaper Desparado (S1E13).
You can hear this line at 00:01:33.033 in the Blu-ray version of the episode.
Quote context
[...]
- I need you for something else.
- Say, you're an obligin' sorta cuss, ain't ya?
- Give a word of cheer. Lend a helping hand. I will dry your tear. I will understand.
- Then you won't mind babysittin' my young'un until I get back, will ya?
- Your young'un? What young'un, may I enquire? Ask, even.
- Why, my pride and joy. Little Hombre. Wait, I'll get him. Come on out, Little Hombre!
- Goo goo, ga ga ga, da da. Googiloo, da da. Ga ga ga, doo doo.
- Heavens to safety pin. I'm gonna be a nursemaid to a 10-gallon, pint-sized pinto, pronto.
- Don't let nothin' happen to Little Hombre, or somethin'll happen to you. Get that?
[...]