teething trouble

borrow trouble

To worry about future events not in one's control and that may not come to pass.

teething issues

Synonym of teething troubles.

teething problem

A problem encountered with any new and untried product, system, or venture.

teething troubles

Problems that are to be expected with any new and untried product, system, or venture.

trouble at mill

Problems outside the household, especially in the workplace.

trouble in paradise

An unexpected problem in a supposedly positive situation, especially in a marital or romantic relationship.