Cambridge dictionary :
"to expect : to think or believe something will happen, or someone will arrive:
We are expecting a lot of applicants for the job.
[ + (that) ] I expect (that) you'll find it somewhere in your bedroom.
I expect (that) he'd have left anyway.
[ + to infinitive ] He didn't expect to see me.
The financial performance of the business is fully expected (= almost certain) to improve.
We were half expecting you not to come back.
(only) to be expected
​
normal and what usually happens:
All parents of small children get tired. It's to be expected."