teething troubles

The event kicked off in Milton Keynes last summer but suffered teething troubles, when fans were stuck in long queues.

Supporters of the Saudi crown prince's ambitious project for opening the kingdom up to the world say these are teething troubles, inevitable when such a traditional culture is undergoing such huge changes.

California, which legalized recreational marijuana in 2018, has had similar teething troubles: In the first year of legalization, legal vendors in the state sold $500 million less worth of marijuana than in the year prior, when it was only permitted for medical use.

Whether this reflects teething troubles or a fundamental shift is unclear, and the changes have been welcomed in some quarters.

Two weeks into the UK's new trading relationship with the EU, there appear to be teething troubles.