it's no/small/little wonder...

(it's) little wonder

It is not at all surprising (that something is the case). I was always terrible at math in school, so it's little wonder that I have such trouble filing my taxes. Little wonder you had such trouble starting the car: the battery is almost completely dead!
See also: little, wonder

(it's) no wonder

It is not surprising or unexpected at all. You just worked a 20-hour shift? It's no wonder you look so tired. No wonder. This wire is completely frayed. I'm surprised the TV kept working as long as it did.
See also: no, wonder

(it's) small wonder

It is not at all surprising (that something is the case). I was always terrible at math in school, so it's small wonder that I have such trouble filing my taxes. Small wonder you had such trouble starting the car: the battery is almost completely dead!
See also: small, wonder
Farlex Dictionary of Idioms.

it’s no/small/little ˈwonder (that)...

it’s not surprising: If you walked all the way, it’s little wonder you’re late. ‘The heating’s gone off.’ ‘I thought it was cold. No wonder!’
See also: little, no, small
Farlex Partner Idioms Dictionary
See also:
  • (it's) little wonder
  • little
  • get (something) off pat
  • have (something) off pat
  • have something off pat
  • have/know/get something off pat
  • know (something) off pat
  • learn (something) off pat
  • think little of
  • think little of (someone or something)