And now, a message from The Family Circus:
It kind of seems like he's questioning what she just told him:
"Mommy, do we hafta have a reason for a hug? I mean, are you sure? You know, I asked around, and nobody else's mommy have a four hug per year limit. Mommy? Mommy?"
(all appropriate credit due to The Comics Curmudgeon, whose bit I'm stealing here.)